diff --git a/608zz_bearing.scad b/608zz_bearing.scad
index 8056a49..c16f075 100644
--- a/608zz_bearing.scad
+++ b/608zz_bearing.scad
@@ -19,6 +19,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module 608zz_bearing(details=false){
   BillOfMaterials("608zz bearing");
@@ -31,7 +32,7 @@ module 608zz_bearing(details=false){
 }
 
 module 608zz_bearing_simple(){
-  color("silver"){
+  material("metal"){
     linear_extrude(height=7)
     difference(){
       circle(r=22/2, $fn=40);
@@ -41,7 +42,7 @@ module 608zz_bearing_simple(){
 }
 
 module 608zz_bearing_detailed(){
-  color("silver"){
+  material("metal"){
     //inner disc
     linear_extrude(height=7)
     difference(){
diff --git a/Metamaquina2.h b/Metamaquina2.h
index f43b02a..dccc3a0 100644
--- a/Metamaquina2.h
+++ b/Metamaquina2.h
@@ -18,7 +18,6 @@
 
 use <Metamaquina2.scad>;
 include <render.h>;
-include <colors.h>;
 
 /*Thickness of acrylic or plywood sheets to use.*/
 thickness = 6; //millimiters
diff --git a/Metamaquina2.scad b/Metamaquina2.scad
index 119173f..38e8fca 100644
--- a/Metamaquina2.scad
+++ b/Metamaquina2.scad
@@ -22,7 +22,6 @@ include <BillOfMaterials.h>;
 extruder_wiring_radius = 6;
 
 //utils
-include <colors.h>;
 use <utils.scad>;
 use <mm2logo.scad>;
 use <rounded_square.scad>;
@@ -2114,7 +2113,6 @@ module XEndIdler(){
 }
 
 module BuildPlatform_pcb(){
-  material("pcb")
   translate([0,0,pcb_height])
   heated_bed();
 }
diff --git a/NEMA.scad b/NEMA.scad
index 692c492..f66b83b 100644
--- a/NEMA.scad
+++ b/NEMA.scad
@@ -22,47 +22,44 @@ include <NEMA.h>;
 include <bolts.h>;
 include <washers.h>;
 use <rounded_square.scad>;
+include <render.h>;
 
 module NEMA17(){
   BillOfMaterials("NEMA17 stepper motor");
 
-  if (render_rubber){
-    color(rubber_color){
-      translate([-NEMA17_width/2, -NEMA17_height/2, -0.1])
-      intersection(){
-        cube([NEMA17_width, NEMA17_height, NEMA17_length]);
-        translate ([NEMA17_width/2, NEMA17_height/2]) cylinder(r=0.87*NEMA17_width*sqrt(2)/2, h=100);
-      }
+  material("rubber"){
+    translate([-NEMA17_width/2, -NEMA17_height/2, -0.1])
+    intersection(){
+      cube([NEMA17_width, NEMA17_height, NEMA17_length]);
+      translate ([NEMA17_width/2, NEMA17_height/2]) cylinder(r=0.87*NEMA17_width*sqrt(2)/2, h=100);
     }
   }
 
-  if (render_metal){
-    color(metal_color){
-      translate([0, 0, -motor_shaft_length])
-      cylinder(r=motor_shaft_diameter/2, h=motor_shaft_length);
-
-      translate([0,0,-3])
-      cylinder(r1=6, r2=8, h=2);      
+  material("metal"){
+    translate([0, 0, -motor_shaft_length])
+    cylinder(r=motor_shaft_diameter/2, h=motor_shaft_length);
 
-      translate([0,0,-0.2]){
-        difference(){
-          linear_extrude(height=NEMA17_length/5)
-          rounded_square([NEMA17_width+2, NEMA17_height+2], center=true, corners=  [5,5,5,5]);
+    translate([0,0,-3])
+    cylinder(r1=6, r2=8, h=2);      
 
-          translate([0,0,-0.2])
-          linear_extrude(height=1)
-          NEMA17_holes(central_hole=false);
-        }
+    translate([0,0,-0.2]){
+      difference(){
+        linear_extrude(height=NEMA17_length/5)
+        rounded_square([NEMA17_width+2, NEMA17_height+2], center=true, corners=  [5,5,5,5]);
 
-        //connector detail
-        translate([-15.6/2,NEMA17_width/2 + 1, NEMA17_length - 4])
-        cube([15.6, 4.6, 4]);
+        translate([0,0,-0.2])
+        linear_extrude(height=1)
+        NEMA17_holes(central_hole=false);
       }
 
-      translate([0,0,NEMA17_length - NEMA17_length/5])
-      linear_extrude(height=NEMA17_length/5)
-      rounded_square([NEMA17_width+2, NEMA17_height+2], center=true, corners=[5,5,5,5]);
+      //connector detail
+      translate([-15.6/2,NEMA17_width/2 + 1, NEMA17_length - 4])
+      cube([15.6, 4.6, 4]);
     }
+
+    translate([0,0,NEMA17_length - NEMA17_length/5])
+    linear_extrude(height=NEMA17_length/5)
+    rounded_square([NEMA17_width+2, NEMA17_height+2], center=true, corners=[5,5,5,5]);
   }
 
   translate([0,0, NEMA17_length - 12.5])
@@ -73,14 +70,14 @@ module connector(){
   //This is very hacky and someone should clean it up
 
   translate([-15/2,NEMA17_width/2 + 1, 4]){
-    color("white")
+    material("nylon")
     difference(){
         cube([15, 6, 4]);
         translate([1,1,0.5]) cube([13, 6, 3]);
         translate([3.5,4,-1]) cube([8, 10, 3]);
     }
 
-    color("grey")
+    material("metal")
     for (i=[0:3]){
       translate([4+i*2.3,6, 2])
       rotate([90,0])
diff --git a/PowerSupply.scad b/PowerSupply.scad
index d15ea38..b72710f 100644
--- a/PowerSupply.scad
+++ b/PowerSupply.scad
@@ -22,7 +22,6 @@ include <PowerSupply.h>;
 include <bolts.h>;
 include <washers.h>;
 include <render.h>;
-include <colors.h>;
 include <rounded_square.scad>;
 include <tslot.scad>;
 
@@ -68,11 +67,8 @@ module oldHiquaPowerSupply(){
     BillOfMaterials("Power Supply cable");
   }
 
-  if (render_metal){
-    color(metal_color){
-      cube([PowerSupply_thickness, PowerSupply_width, PowerSupply_height]);
-    }
-  }
+  material("metal")
+  cube([PowerSupply_thickness, PowerSupply_width, PowerSupply_height]);
 }
 
 metal_sheet_thickness = 1;
@@ -99,35 +95,31 @@ module HiquaPowerSupply(){
     BillOfMaterials("Power Supply cable");
   }
 
-  if (render_metal){
-    color(metal_color){
-      cube([PowerSupply_width, PowerSupply_height, metal_sheet_thickness]);
+  material("metal"){
+    cube([PowerSupply_width, PowerSupply_height, metal_sheet_thickness]);
 
-      translate([PowerSupply_width - metal_sheet_thickness, 0])
-      cube([metal_sheet_thickness, PowerSupply_height, PowerSupply_thickness]);
+    translate([PowerSupply_width - metal_sheet_thickness, 0])
+    cube([metal_sheet_thickness, PowerSupply_height, PowerSupply_thickness]);
 
-      translate([0,bottom_offset])
-      difference(){
-        cube([PowerSupply_width, PowerSupply_height - bottom_offset - top_offset, PowerSupply_thickness]);
+    translate([0,bottom_offset])
+    difference(){
+      cube([PowerSupply_width, PowerSupply_height - bottom_offset - top_offset, PowerSupply_thickness]);
 
-        translate([metal_sheet_thickness, metal_sheet_thickness])
-        cube([PowerSupply_width - 2*metal_sheet_thickness, PowerSupply_height - bottom_offset - top_offset - 2*metal_sheet_thickness, PowerSupply_thickness - metal_sheet_thickness]);
+      translate([metal_sheet_thickness, metal_sheet_thickness])
+      cube([PowerSupply_width - 2*metal_sheet_thickness, PowerSupply_height - bottom_offset - top_offset - 2*metal_sheet_thickness, PowerSupply_thickness - metal_sheet_thickness]);
 
-        if (detail){
-          translate([-23.5, 7, PowerSupply_thickness - 1.5*metal_sheet_thickness]){
-            linear_extrude(height=2*metal_sheet_thickness)
-            circle_pattern(r=4.6/2, spacing_x=6, spacing_y = 5, x=21,y=34);
-          }
+      if (detail){
+        translate([-23.5, 7, PowerSupply_thickness - 1.5*metal_sheet_thickness]){
+          linear_extrude(height=2*metal_sheet_thickness)
+          circle_pattern(r=4.6/2, spacing_x=6, spacing_y = 5, x=21,y=34);
         }
       }
     }
   }
 
-  if (render_pcb){
-    color(pcb_color){
-      translate([metal_sheet_thickness, -pcb_bottom_advance, pcb_height])
-      cube([PowerSupply_width - 2*metal_sheet_thickness, PowerSupply_height - top_offset, pcb_thickness]);
-    }
+  material("pcb"){
+    translate([metal_sheet_thickness, -pcb_bottom_advance, pcb_height])
+    cube([PowerSupply_width - 2*metal_sheet_thickness, PowerSupply_height - top_offset, pcb_thickness]);
   }
 }
 
@@ -257,34 +249,25 @@ module PowerSupplyBox_back_face(){
 module PowerSupplyBox_side_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="Power Supply Box side sheet");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=thickness)
-      PowerSupplyBox_side_face();
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=thickness)
+  PowerSupplyBox_side_face();
 }
 
 module PowerSupplyBox_bottom_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="Power Supply Box bottom sheet");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=thickness)
-      PowerSupplyBox_bottom_face();
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=thickness)
+  PowerSupplyBox_bottom_face();
 }
 
 module PowerSupplyBox_front_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="Power Supply Box front sheet");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=thickness)
-      PowerSupplyBox_front_face();
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=thickness)
+  PowerSupplyBox_front_face();
 
   ONOFF_Switch();
 }
@@ -292,12 +275,9 @@ module PowerSupplyBox_front_sheet(){
 module PowerSupplyBox_back_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="Power Supply Box back sheet");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=thickness)
-      PowerSupplyBox_back_face();
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=thickness)
+  PowerSupplyBox_back_face();
 
   translate([PowerSupply_thickness-thickness-PSU_Female_border_height/2, (box_height - bottom_offset)/2])
   rotate(90)
@@ -346,45 +326,43 @@ module PowerSupply_FemaleConnector(){
   border_thickness = 6.1;
   depth = 13.1;
 
-  if (render_ABS){
-    color(ABS_color){
-      difference(){
-        union(){
-          translate([0,0,-depth])
-          linear_extrude(height=depth)
-          PowerSupply_FemaleConnector_large_hole();
+  material("ABS"){
+    difference(){
+      union(){
+        translate([0,0,-depth])
+        linear_extrude(height=depth)
+        PowerSupply_FemaleConnector_large_hole();
+
+        linear_extrude(height=border_thickness)
+        translate([-border_width/2,-border_height/2])
+        rounded_square([border_width, border_height], corners=[2,2,2,2]);
 
-          linear_extrude(height=border_thickness)
+        linear_extrude(height=3.9)
+        hull(){
           translate([-border_width/2,-border_height/2])
           rounded_square([border_width, border_height], corners=[2,2,2,2]);
 
-          linear_extrude(height=3.9)
-          hull(){
-            translate([-border_width/2,-border_height/2])
-            rounded_square([border_width, border_height], corners=[2,2,2,2]);
-
-            for (i=[-1,1])
-              translate([i*power_supply_bolts_distance/2, 0])
-              circle(r=6);
-          }
+          for (i=[-1,1])
+            translate([i*power_supply_bolts_distance/2, 0])
+            circle(r=6);
         }
+      }
 
-        translate([0,0,border_thickness+0.1-depth])
-        linear_extrude(height=depth)
-        power_supply_generic_connector_shape(
-          width=24.6,
-          height=16.4,
-          bevel=4.2,
-          r1=1,
-          r2=2);
-
-        for (i=[-1,1]){
-          translate([i*power_supply_bolts_distance/2,0,-0.1])
-          cylinder(r=m3_diameter/2, h=10);
-
-          translate([i*power_supply_bolts_distance/2,0,2])
-          cylinder(r1=m3_diameter/2, r2=m3_diameter, h=3.9 - 2 + 0.1);
-        }
+      translate([0,0,border_thickness+0.1-depth])
+      linear_extrude(height=depth)
+      power_supply_generic_connector_shape(
+        width=24.6,
+        height=16.4,
+        bevel=4.2,
+        r1=1,
+        r2=2);
+
+      for (i=[-1,1]){
+        translate([i*power_supply_bolts_distance/2,0,-0.1])
+        cylinder(r=m3_diameter/2, h=10);
+
+        translate([i*power_supply_bolts_distance/2,0,2])
+        cylinder(r1=m3_diameter/2, r2=m3_diameter, h=3.9 - 2 + 0.1);
       }
     }
   }
diff --git a/RAMBo.scad b/RAMBo.scad
index 9fb6033..fcd658e 100644
--- a/RAMBo.scad
+++ b/RAMBo.scad
@@ -21,6 +21,7 @@ include <Metamaquina2.h>;
 include <BillOfMaterials.h>;
 use <rounded_square.scad>;
 include <spacer.h>;
+include <render.h>;
 
 RAMBo_pcb_thickness = 2;
 M3_bolt_head = 3;
@@ -46,8 +47,7 @@ module PSU_connector(){
   bolt_diameter = 3.5;
   bolts_offset = -2.3;
 
-  if (render_rubber)
-  color(rubber_color)
+  material("rubber")
   difference() {
     cube([conn_thickness, conn_width, conn_height]);
 
@@ -59,7 +59,6 @@ module PSU_connector(){
   }
 }
 
-acrylic_color = [1, 0.5, 0.5, 0.7];//red-transparent
 module RAMBo_cover_curves(border=0){
   difference(){
     translate([-border,-border])
@@ -70,12 +69,11 @@ module RAMBo_cover_curves(border=0){
 }
 
 module RAMBo_cover(){
-    BillOfMaterials("Lasercut acrylic RAMBo cover");
-  if (render_acrylic){
-    color(acrylic_color)
-    linear_extrude(height=RAMBo_cover_thickness)
-    RAMBo_cover_curves();
-  }
+  BillOfMaterials("Lasercut acrylic RAMBo cover");
+
+  material("acrylic")
+  linear_extrude(height=RAMBo_cover_thickness)
+  RAMBo_cover_curves();
 }
 
 module RAMBo(){
@@ -95,8 +93,7 @@ module RAMBo(){
           hexspacer_38mm();
           translate([0,0,hexspacer_length+RAMBo_cover_thickness]){
             //bolt head
-            if (render_metal)
-            color(metal_color)
+            material("metal")
             cylinder(r=3, h=M3_bolt_head, $fn=20);
           }
         }
@@ -200,13 +197,11 @@ module RAMBo_holes(){
 }
 
 module RAMBo_pcb(){
-  if (render_pcb){
-    color(pcb_color){
-      linear_extrude(height=RAMBo_pcb_thickness){
-        difference(){
-          square([RAMBo_width, RAMBo_height]);
-          RAMBo_holes();
-        }
+  material("pcb"){
+    linear_extrude(height=RAMBo_pcb_thickness){
+      difference(){
+        square([RAMBo_width, RAMBo_height]);
+        RAMBo_holes();
       }
     }
   }
diff --git a/ZLink.scad b/ZLink.scad
index ef9e890..323213e 100644
--- a/ZLink.scad
+++ b/ZLink.scad
@@ -24,52 +24,51 @@
 include <Metamaquina2.h>;
 include <ZLink.h>;
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module ZLink(clearance = 0.2, hull_size=0){
   BillOfMaterials(category="3D Printed", partname="ZLink");
 
-  if (render_ABS){
-    color(ABS_color){
-      difference(){
-        union(){
-          linear_extrude(height=2.6){
-	          difference(){
-		          hull(){
-                for (i=[-1,1])
-        			    translate([i*dx_z_threaded, 0])
-        			    circle(r=6);
-		          }
+  material("ABS"){
+    difference(){
+      union(){
+        linear_extrude(height=2.6){
+          difference(){
+	          hull(){
               for (i=[-1,1])
-		            translate([i*dx_z_threaded, 0])
-		            circle(r=m3_diameter/2, $fn=20);
+      			    translate([i*dx_z_threaded, 0])
+      			    circle(r=6);
 	          }
+            for (i=[-1,1])
+	            translate([i*dx_z_threaded, 0])
+	            circle(r=m3_diameter/2, $fn=20);
           }
-          for (i=[-1,1])
-        		translate([i*dx_z_threaded, 0, 2.6]) cylinder(r=5, h=2, $fn=6);
         }
-
         for (i=[-1,1])
-          translate([i*dx_z_threaded, 0, 2]) cylinder(r=3, h=5, $fn=6);
+      		translate([i*dx_z_threaded, 0, 2.6]) cylinder(r=5, h=2, $fn=6);
       }
 
-      translate([0,Zlink_hole_height, ZLink_rod_height])
-      rotate([90, 0, 0]){
-        linear_extrude(height=XPlatform_height - thickness)
-        difference(){
-	        circle($fn=6, r=11);
-	        circle($fn=6, r=8);
-        }
+      for (i=[-1,1])
+        translate([i*dx_z_threaded, 0, 2]) cylinder(r=3, h=5, $fn=6);
+    }
 
-        translate([0,0,7]){
-	        linear_extrude(height=4)
-	        difference(){
-		        circle($fn=6, r=10);
-			    hull(){
-				    for (i=[-1,1])
-				    translate([0,i*hull_size/2])
-			        circle($fn=20, r=(8+clearance)/2);
-			    }
-	        }
+    translate([0,Zlink_hole_height, ZLink_rod_height])
+    rotate([90, 0, 0]){
+      linear_extrude(height=XPlatform_height - thickness)
+      difference(){
+        circle($fn=6, r=11);
+        circle($fn=6, r=8);
+      }
+
+      translate([0,0,7]){
+        linear_extrude(height=4)
+        difference(){
+	        circle($fn=6, r=10);
+		    hull(){
+			    for (i=[-1,1])
+			    translate([0,i*hull_size/2])
+		        circle($fn=20, r=(8+clearance)/2);
+		    }
         }
       }
     }
diff --git a/bar-clamp.scad b/bar-clamp.scad
index c9921fe..f069cf9 100644
--- a/bar-clamp.scad
+++ b/bar-clamp.scad
@@ -29,38 +29,35 @@
 include <configuration.scad>
 include <BillOfMaterials.h>;
 include <render.h>
-include <colors.h>
 
 module barclamp(){
   BillOfMaterials(category="3D Printed", partname="Bar Clamp");
 
   outer_diameter = threaded_rod_diameter/2 + 2.4;
 
-  if (render_ABS){
-    color(ABS_color){
-      difference(){
-        union(){
-          translate([outer_diameter, outer_diameter, 0])
-          cylinder(h =outer_diameter*2, r = outer_diameter, $fn = 100);
+  material("ABS"){
+    difference(){
+      union(){
+        translate([outer_diameter, outer_diameter, 0])
+        cylinder(h =outer_diameter*2, r = outer_diameter, $fn = 100);
 
-          translate([outer_diameter, 0, 0])
-          cube([outer_diameter+1.5,outer_diameter*2,outer_diameter*2]);
+        translate([outer_diameter, 0, 0])
+        cube([outer_diameter+1.5,outer_diameter*2,outer_diameter*2]);
 
-          translate([18, 2*outer_diameter, outer_diameter])
-          rotate([90, 0, 0])
-          nut(outer_diameter*2, outer_diameter*2, false);
-        }
+        translate([18, 2*outer_diameter, outer_diameter])
+        rotate([90, 0, 0])
+        nut(outer_diameter*2, outer_diameter*2, false);
+      }
 
-        translate([18, outer_diameter, 9])
-        cube([18,05,20], center=true);
+      translate([18, outer_diameter, 9])
+      cube([18,05,20], center=true);
 
-        translate([outer_diameter, outer_diameter, -1])
-        cylinder(h = 20, r = threaded_rod_diameter/2, $fn = 80);
+      translate([outer_diameter, outer_diameter, -1])
+      cylinder(h = 20, r = threaded_rod_diameter/2, $fn = 80);
 
-        translate([17, 17, outer_diameter])
-        rotate([90, 00, 00])
-        cylinder(h = 20, r = threaded_rod_diameter/2, $fn = 80);
-      }
+      translate([17, 17, outer_diameter])
+      rotate([90, 00, 00])
+      cylinder(h = 20, r = threaded_rod_diameter/2, $fn = 80);
     }
   }
 }
diff --git a/belt-clamp.scad b/belt-clamp.scad
index 7f65587..dcf1e8d 100644
--- a/belt-clamp.scad
+++ b/belt-clamp.scad
@@ -21,7 +21,6 @@
 
 include <BillOfMaterials.h>;
 include <render.h>;
-include <colors.h>;
 
 module belt_clamp_holder(){
   r = 5;
@@ -81,17 +80,15 @@ module teeth_for_belt(belt_width=6){
 module beltclamp(width=28, height=6, r=5, teeth_depth=0.5){
   BillOfMaterials(category="3D Printed", partname="Belt Clamp");
 
-  if (render_ABS){
-    color(ABS_color){
-      render()
-      difference(){
-        linear_extrude(height=height)
-        beltclamp_curves(width, r);
+  material("ABS"){
+    render()
+    difference(){
+      linear_extrude(height=height)
+      beltclamp_curves(width, r);
 
-        translate([0, 0, height-teeth_depth]){
-          linear_extrude(height = teeth_depth+1)
-          teeth_for_belt();
-        }
+      translate([0, 0, height-teeth_depth]){
+        linear_extrude(height = teeth_depth+1)
+        teeth_for_belt();
       }
     }
   }
@@ -100,23 +97,17 @@ module beltclamp(width=28, height=6, r=5, teeth_depth=0.5){
 module x_carriage_beltclamp(width=28, height=6, r=5){
   BillOfMaterials(category="Lasercut wood", partname="X Carriage Belt Clamp");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=height)
-      beltclamp_curves(width, r, for_x_carriage=true);
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=height)
+  beltclamp_curves(width, r, for_x_carriage=true);
 }
 
 module y_platform_beltclamp(width=28, height=6, r=5){
   BillOfMaterials(category="Lasercut wood", partname="Y Platform Belt Clamp");
 
-  if (render_lasercut){
-    color(sheet_color){
-      linear_extrude(height=height)
-      beltclamp_curves(width, r, for_y_platform=true);
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=height)
+  beltclamp_curves(width, r, for_y_platform=true);
 }
 
 beltclamp(); //for 3d printing
diff --git a/bolts.scad b/bolts.scad
index f324515..d71329a 100644
--- a/bolts.scad
+++ b/bolts.scad
@@ -19,7 +19,6 @@
 include <BillOfMaterials.h>;
 include <bolts.h>;
 include <render.h>;
-include <colors.h>;
 
 module M3x10(){
   bolt(3,10);  
@@ -37,12 +36,11 @@ module bolt_head(r, h){
 module bolt(dia, length){
   BillOfMaterials(str("M",dia,"x",length," bolt"));
 
-  if (render_metal)
-  color(metal_color){
+  material("metal"){
     bolt_head(r=dia, h=dia);
-    translate([0,0,-length]){
-      cylinder(r=dia/2, h=length, $fn=60);
-    }
+
+    translate([0,0,-length])
+    cylinder(r=dia/2, h=length, $fn=60);
   }
 }
 
diff --git a/cable_clips.scad b/cable_clips.scad
index 3ac00cb..841377a 100644
--- a/cable_clips.scad
+++ b/cable_clips.scad
@@ -17,6 +17,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module ring(r, R, start=0, end=360){
     N=200;
@@ -95,11 +96,11 @@ module cable_clip_model(D, H, L, W, W2, clip_thickness){
 }
 
 module hellerman_cable_clip_with_sticker(D, H, L, W, W2, sticker_thickness=1, clip_thickness){
-    color("grey")
+    material("rubber")
     translate([-L/2, -W/2])
     cube([L, W, sticker_thickness]);
 
-    color("white")
+    material("nylon")
     translate([0,0,sticker_thickness])
     cable_clip_model(D=D, H=H, L=L, W=W, W2=W2, clip_thickness=clip_thickness);
 }
@@ -180,4 +181,3 @@ translate([43,0]) RA9_cable_clip();
 translate([70,0]) RA13_cable_clip();
 translate([103,0]) RA18_cable_clip();
 
-
diff --git a/colors.h b/colors.h
deleted file mode 100644
index ea29123..0000000
--- a/colors.h
+++ /dev/null
@@ -1,35 +0,0 @@
-// (c) 2013 Metamáquina <http://www.metamaquina.com.br/>
-//
-// Author:
-// * Felipe C. da S. Sanches <fsanches@metamaquina.com.br>
-//
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, either version 3 of the License, or
-// (at your option) any later version.
-//
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU General Public License
-// along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-dark_green = [0,0.2,0];
-rubber_color = [0.1, 0.1, 0.1];
-nozzle_color = "gold";
-pcb_color = [1.0, 0.0, 0.0];
-glass_color = [0.6, 0.6, 1, 0.4];
-threaded_metal_color = [0.6, 0.6, 0.6];
-metal_color = [0.7, 0.7, 0.7];
-powersupply_color = metal_color;
-PLA_color = [0.95, 0.35, 0.35];
-ABS_color = [0.35, 0.35, 0.35];
-sheet_color = [227/230, 190/230, 151/230];
-peek_color = "beige";
-dark_grey = [0.3, 0.3, 0.3];
-green_plastic_color = [0.7,0.8,0,7];
-black_plastic_color = [0.3,0.3,0.3];
-white_nylon_color = [1, 1, 0.8];
-
diff --git a/coupling.scad b/coupling.scad
index 2dbc291..5db7c92 100644
--- a/coupling.scad
+++ b/coupling.scad
@@ -18,13 +18,13 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 include <coupling.h>;
-include <colors.h>;
+include <render.h>;
 include <BillOfMaterials.h>;
 
 module coupling(shaft_diameter=5, rod_diameter=8){
   BillOfMaterials("Coupling for the Z axis");
 
-  color(metal_color)
+  material("metal")
   difference(){
     cylinder(r=coupling_diameter/2, h=coupling_length, $fn=60);
 
diff --git a/detailed_608zz_bearing.scad b/detailed_608zz_bearing.scad
index 3e042d1..cbdd21b 100644
--- a/detailed_608zz_bearing.scad
+++ b/detailed_608zz_bearing.scad
@@ -21,7 +21,7 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 use <rounded_square.scad>;
-include <colors.h>;
+include <render.h>;
 
 //include <render.h>;
 $fa=0.01;
@@ -73,7 +73,7 @@ module bearing_internal_cut(){
 }
 
 module detailed_608zz_bearing_body(){
-    color(metal_color)
+    material("metal")
     rotate_extrude() detailed_608zz_bearing_2d();
 }
 
@@ -94,7 +94,7 @@ module detailed_608zz_bearing() {
 }
 
 module detailed_608zz_balls(){
-    color(metal_color)
+    material("metal")
     for (i=[1:608zz_num_balls])
         rotate(i*360/608zz_num_balls)
             translate([608zz_race_radius, 0])
@@ -112,7 +112,8 @@ module detailed_608zz_ball_cage2(){
 
 module detailed_608zz_ball_cage(){
     translate([0,0,608zz_cage_clearance])
-    color("brown")render(){
+    material("metal")
+    render(){
 
         linear_extrude(height=608zz_cage_thickness)
         difference(){
diff --git a/endstop.scad b/endstop.scad
index 3103be8..b7c4e6e 100644
--- a/endstop.scad
+++ b/endstop.scad
@@ -21,6 +21,7 @@ include <BillOfMaterials.h>;
 include <endstop.h>;
 use <utils.scad>;
 use <rounded_square.scad>;
+include <render.h>;
 
 m3_diameter=3; //TODO: move-me to a header file
 
@@ -114,10 +115,10 @@ module simples_mechanical_endstop(){
   thickness = 5;//TODO
 
   if (render_rubber)
-  color(rubber_color)
+  material("rubber")
   cube([microswitch_width, microswitch_height, thickness]);
 
-  color(metal_color){
+  material("metal"){
     translate([2, microswitch_height+3])
     rotate(10)
     cube([microswitch_width-2, 1, thickness]);
@@ -164,7 +165,7 @@ module ymax_endstop_subassembly(){
 }
 
 module YMIN_endstop_spacer_sheet(){
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   endstop_spacer_face2();
 }
@@ -320,8 +321,7 @@ module mechanical_switch(bom=true){
 
   metal_thickness = 1;
 
-  if (render_rubber)
-  color(rubber_color)
+  material("rubber")
   linear_extrude(height=microswitch_thickness){
     difference(){
       square([microswitch_width, microswitch_height]);
@@ -332,8 +332,7 @@ module mechanical_switch(bom=true){
     }
   }
 
-  if (render_metal)
-  color(metal_color)
+  material("metal")
   translate([2, microswitch_height+3, 1]){
     linear_extrude(height=microswitch_thickness-2){
       hull(){
@@ -359,7 +358,7 @@ module optical_endstop(){
 module ymin_endstop_spacer_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="YMIN Spacer");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   ymin_endstop_spacer_face();
 }
@@ -367,7 +366,7 @@ module ymin_endstop_spacer_sheet(){
 module ymax_endstop_spacer_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="YMAX Spacer");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   ymax_endstop_spacer_face();
 }
@@ -375,23 +374,23 @@ module ymax_endstop_spacer_sheet(){
 module zmax_endstop_spacer_sheet1(){
   BillOfMaterials(category="Lasercut wood", partname="ZMAX Spacer #1");
 
-    color(sheet_color)
-    linear_extrude(height=thickness)
-    zmax_endstop_spacer_face1();
+  material("lasercut")
+  linear_extrude(height=thickness)
+  zmax_endstop_spacer_face1();
 }
 
 module zmax_endstop_spacer_sheet2(){
   BillOfMaterials(category="Lasercut wood", partname="ZMAX Spacer #2");
 
-    color(sheet_color)
-    linear_extrude(height=thickness)
-    zmax_endstop_spacer_face2();
+  material("lasercut")
+  linear_extrude(height=thickness)
+  zmax_endstop_spacer_face2();
 }
 
 module zmin_endstop_spacer_sheet1(){
   BillOfMaterials(category="Lasercut wood", partname="ZMIN Spacer #1");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   zmin_endstop_spacer_face1();
 }
@@ -399,7 +398,7 @@ module zmin_endstop_spacer_sheet1(){
 module zmin_endstop_spacer_sheet2(){
   BillOfMaterials(category="Lasercut wood", partname="ZMIN Spacer #2");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   zmin_endstop_spacer_face2();
 }
diff --git a/heated_bed.scad b/heated_bed.scad
index 89b0938..ab3e974 100644
--- a/heated_bed.scad
+++ b/heated_bed.scad
@@ -19,15 +19,15 @@
 include <Metamaquina2.h>;
 include <BillOfMaterials.h>;
 include <heated_bed.h>;
-include <colors.h>;
+include <render.h>;
 use <rounded_square.scad>;
 
 module heated_bed_pcb(width = heated_bed_pcb_width, height = heated_bed_pcb_height){
-    BillOfMaterials("Heated bed PCB");
+  BillOfMaterials("Heated bed PCB");
 
-    color(pcb_color)
-    linear_extrude(height=heated_bed_pcb_thickness)
-    heated_bed_pcb_curves(width=width, height=height);
+  material("pcb")
+  linear_extrude(height=heated_bed_pcb_thickness)
+heated_bed_pcb_curves(width=width, height=height);
 }
 
 module heated_bed_pcb_curves(width = heated_bed_pcb_width, height = heated_bed_pcb_height, connector_holes=true){
@@ -61,21 +61,20 @@ module heated_bed_pcb_curves(width = heated_bed_pcb_width, height = heated_bed_p
 }
 
 module heated_bed_silk(width = heated_bed_pcb_width, height = heated_bed_pcb_height){
-    line_thickness = 1;
-    color("white"){
-        translate([0,0,heated_bed_pcb_thickness+0.1])
-        difference(){
-            square([200,200], center=true);
-            square([200-2*line_thickness,200-2*line_thickness], center=true);
-        }
+  line_thickness = 1;
+  material("silk"){
+    translate([0,0,heated_bed_pcb_thickness+0.1])
+    difference(){
+      square([200,200], center=true);
+      square([200-2*line_thickness,200-2*line_thickness], center=true);
     }
+  }
 }
 
 module heated_bed_glass(){
   BillOfMaterials(str(heated_bed_glass_thickness, "mm glass for the build platform (",glass_w,"mm x ",glass_h,"mm)"));
 
-  if(render_glass)
-  color(glass_color)
+  material("glass")
   translate([-glass_w/2, -glass_h/2, heated_bed_pcb_thickness])
   cube([glass_w, glass_h, heated_bed_glass_thickness]);
 }
diff --git a/jhead.scad b/jhead.scad
index d9a8f07..968541e 100644
--- a/jhead.scad
+++ b/jhead.scad
@@ -19,6 +19,7 @@
 include <Metamaquina2.h>;
 include <BillOfMaterials.h>;
 include <jhead.h>;
+include <render.h>;
 use <nozzle.scad>;
 
 module J_head_assembly(){
@@ -36,14 +37,12 @@ module J_head_body(){
     BillOfMaterials("PTFE liner");
   }
 
-  if (render_peek){
-    color(peek_color){
-      translate([0,0,-50+4.76+4.64]){
-        cylinder(h=50,r=6);
-        cylinder(h=50-4.76-4.64,r=(5/8)*inch/2);
-        translate([0,0,50-4.76])
-        cylinder(h=4.64,r=(5/8)*inch/2);
-      }
+  material("peek"){
+    translate([0,0,-50+4.76+4.64]){
+      cylinder(h=50,r=6);
+      cylinder(h=50-4.76-4.64,r=(5/8)*inch/2);
+      translate([0,0,50-4.76])
+      cylinder(h=4.64,r=(5/8)*inch/2);
     }
   }
 }
diff --git a/large_extruder_gear.scad b/large_extruder_gear.scad
index 1e2c931..8e81a57 100644
--- a/large_extruder_gear.scad
+++ b/large_extruder_gear.scad
@@ -22,6 +22,7 @@
 use <gears.scad>;
 include <gears-params.scad>;
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module extruder_gear(teeth=37, circles=12, shaft=8.6){
   BillOfMaterials(category="3D Printed", partname="Large Extruder Gear");
@@ -29,6 +30,7 @@ module extruder_gear(teeth=37, circles=12, shaft=8.6){
   body_thickness = 4;
   hub_thickness = 8;
 
+  material("ABS")
   difference(){
     union() {
       //hub
diff --git a/lasercut_extruder.scad b/lasercut_extruder.scad
index ec3af44..38c9c9f 100644
--- a/lasercut_extruder.scad
+++ b/lasercut_extruder.scad
@@ -76,11 +76,9 @@ module handle_face(r=5, width=HandleWidth, height=HandleHeight){
 module handle_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Handle");
 
-  color(sheet_color){
-    linear_extrude(height=thickness){
-      handle_face();
-    }
-  }
+  material("lasercut")
+  linear_extrude(height=thickness)
+  handle_face();
 }
 
 //!idler_side_face();
@@ -146,7 +144,7 @@ module idler_back_face(){
 module idler_back_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Idler Back");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   idler_back_face();
 }
@@ -154,7 +152,7 @@ module idler_back_sheet(){
 module idler_side_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Idler Side");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   idler_side_face();
 }
@@ -162,7 +160,7 @@ module idler_side_sheet(){
 module idler_spacer_sheet(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Idler Spacer");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   idler_spacer_face();
 }
@@ -412,7 +410,7 @@ module extruder_slice(motor_holder=false, bearing_slot=false, filament_channel=f
 module slice1(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Slice #1");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   slice1_face();
 }
@@ -420,7 +418,7 @@ module slice1(){
 module slice2(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Slice #2");
 
-  color(sheet_color)
+  material("lasercut")
   translate([0,0,1*thickness])
   linear_extrude(height=thickness)
   slice2_face();
@@ -430,7 +428,7 @@ module slice2(){
 module slice3(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Slice #3");
 
-  color(sheet_color)
+  material("lasercut")
   translate([0,0,2*thickness])
   linear_extrude(height=thickness)
   slice3_face();
@@ -439,7 +437,7 @@ module slice3(){
 module slice4(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Slice #4");
 
-  color(sheet_color)
+  material("lasercut")
   translate([0,0,3*thickness])
   linear_extrude(height=thickness)
   slice4_face();
@@ -448,7 +446,7 @@ module slice4(){
 module slice5(){
   BillOfMaterials(category="Lasercut wood", partname="LCExtruder Slice #5");
 
-  color(sheet_color)
+  material("lasercut")
   translate([0,0,4*thickness])
   linear_extrude(height=thickness)
   slice5_face();
@@ -481,6 +479,7 @@ module idler_bolt_subassembly(){
   BillOfMaterials(str("M8x", length, "mm Threaded Rod"));
 
   //bolt body
+  material("threaded metal")
   translate([0,0,-length])
   cylinder(r=7.3/2, h=length);
 }
@@ -495,8 +494,6 @@ module idler(){
   R=23;
   bearing_thickness = 7;
 
-  if (render_metal)
-  color(metal_color)
   rotate([90,0])
     translate([0,0,5*thickness])
     translate(idler_bearing_position)
@@ -562,8 +559,7 @@ module extruder_block(){
 
 //JHead MKIV nozzle
 module nozzle(length=50){
-  if (render_rubber)
-  color(rubber_color){
+  material("rubber"){
     difference(){
       union(){
         translate([0,0,5])
@@ -582,6 +578,8 @@ module nozzle(length=50){
 
 module hobbed_bolt(){
   BillOfMaterials("Hobbed bolt");
+
+  material("metal")
   rotate([90,0])
   cylinder(r=7.2/2, h=5*thickness);
 }
@@ -605,26 +603,20 @@ module lasercut_extruder(){
 
     nozzle();
 
-    if (render_ABS){
-      color(ABS_color)
-      translate([hobbed_bolt_position[0], -5*thickness/2 - 2*washer_thickness, hobbed_bolt_position[1]])
-      rotate([0,extruder_gear_angle])
-      rotate([90,0])
-      extruder_gear(teeth=37);
-    }
+    translate([hobbed_bolt_position[0], -5*thickness/2 - 2*washer_thickness, hobbed_bolt_position[1]])
+    rotate([0,extruder_gear_angle])
+    rotate([90,0])
+    extruder_gear(teeth=37);
 
-    if (render_metal){
-      color(metal_color)
-      translate([hobbed_bolt_position[0], 5*thickness/2, hobbed_bolt_position[1]]) hobbed_bolt();
+    translate([hobbed_bolt_position[0], 5*thickness/2, hobbed_bolt_position[1]]) hobbed_bolt();
 
-      translate([hobbed_bolt_position[0], -3*thickness/2, hobbed_bolt_position[1]])
-      rotate([90,0])
-      608zz_bearing(true);
+    translate([hobbed_bolt_position[0], -3*thickness/2, hobbed_bolt_position[1]])
+    rotate([90,0])
+    608zz_bearing(true);
 
-      translate([hobbed_bolt_position[0], 3*thickness/2+7, hobbed_bolt_position[1]])
-      rotate([90,0])
-      608zz_bearing(true);
-    }
+    translate([hobbed_bolt_position[0], 3*thickness/2+7, hobbed_bolt_position[1]])
+    rotate([90,0])
+    608zz_bearing(true);
 
     translate([motor_position[0], -thickness/2, motor_position[1]])
     rotate([-90,0])
@@ -633,11 +625,8 @@ module lasercut_extruder(){
       NEMA17_subassembly();
 
       translate([0,0,-2*thickness - 2*washer_thickness])
-      if (render_ABS){
-        color(ABS_color)
-        rotate([180,0])
-        motor_gear(teeth=11);
-      }
+      rotate([180,0])
+      motor_gear(teeth=11);
     }
   }
 }
diff --git a/lm8uu_bearing.scad b/lm8uu_bearing.scad
index 8581682..4f8442a 100644
--- a/lm8uu_bearing.scad
+++ b/lm8uu_bearing.scad
@@ -17,7 +17,6 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 include <lm8uu_bearing.h>;
-include <colors.h>;
 include <render.h>;
 include <BillOfMaterials.h>;
 
@@ -25,16 +24,13 @@ module LM8UU(bom=true){
   if (bom)
     BillOfMaterials("LM8UU linear bearing");
 
-  if (render_metal){
-    color(metal_color){
-      translate([0,lm8uu_length/2])
-      rotate([90,0])
-      linear_extrude(height=lm8uu_length)
-      difference(){
-          circle(r=lm8uu_diameter/2);
-          circle(r=lm8uu_internal_diameter/2);
-      }
-    }
+  material("metal")
+  translate([0,lm8uu_length/2])
+  rotate([90,0])
+  linear_extrude(height=lm8uu_length)
+  difference(){
+      circle(r=lm8uu_diameter/2);
+      circle(r=lm8uu_internal_diameter/2);
   }
 }
 
diff --git a/nozzle.scad b/nozzle.scad
index 66d4084..37c8071 100644
--- a/nozzle.scad
+++ b/nozzle.scad
@@ -2,6 +2,7 @@
 
 include <Metamaquina2.h>;
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module v4nozzle(){
   BillOfMaterials("JHead nozzle");
@@ -13,7 +14,7 @@ module v4nozzle(){
   }
 
   if (render_nozzle){
-    color (nozzle_color){
+    material("golden"){
       scale(25.4)
       difference() {
         union() {
diff --git a/nuts.scad b/nuts.scad
index 331d333..59c9df1 100644
--- a/nuts.scad
+++ b/nuts.scad
@@ -19,7 +19,7 @@
 
 include <BillOfMaterials.h>;
 include <nuts.h>;
-include <colors.h>;
+include <render.h>;
 
 module M25_nut(){
   BillOfMaterials("M2.5 nut");
@@ -67,7 +67,7 @@ epsilon = 0.05;
 
 // Commented lines are not working for all sizes
 module nut(r, R, H){
-  color(metal_color)
+  material("metal")
   difference(){
     //hexagon
     intersection(){
diff --git a/render.h b/render.h
index 8d860e5..82e46ba 100644
--- a/render.h
+++ b/render.h
@@ -22,7 +22,23 @@
 // $fs is the minimum size of a fragment. Because of this variable very small circles have a smaller number of fragments than specified using $fa. The default value is 2. The minimum allowed value is 0.01.
 $fs = 0.5;
 
-include <colors.h>;
+dark_green = [0,0.2,0];
+rubber_color = [0.1, 0.1, 0.1];
+nozzle_color = "gold";
+pcb_color = [1.0, 0.0, 0.0];
+glass_color = [0.6, 0.6, 1, 0.4];
+threaded_metal_color = [0.6, 0.6, 0.6];
+metal_color = [0.7, 0.7, 0.7];
+powersupply_color = metal_color;
+PLA_color = [0.95, 0.35, 0.35];
+ABS_color = [0.35, 0.35, 0.35];
+sheet_color = [227/230, 190/230, 151/230];
+peek_color = "beige";
+dark_grey = [0.3, 0.3, 0.3];
+green_plastic_color = [0.7,0.8,0,7];
+black_plastic_color = [0.3,0.3,0.3];
+nylon_color = [1, 1, 0.8];
+acrylic_color = [1, 0.6, 0.6, 0.4];
 
 render_materials = [
   "lasercut",
@@ -31,69 +47,73 @@ render_materials = [
   "ABS",
   "PLA",
   "metal",
-  "threaded_metal",
+  "threaded metal",
   "rubber",
   "peek",
   "nylon",
-  "acrylic"];
-
-//rendering configs:
-render_lasercut=true;
-render_pcb=true;
-render_glass=true;
-render_ABS=true;
-render_PLA=true;
-render_metal=true;
-render_threaded_metal=true;
-render_rubber=true;
-render_peek=true;
-render_nylon=true;
-render_acrylic=true;
+  "acrylic",
+  "silk",
+  "golden"];
 
-module material(id){
-  if (id=="lasercut")
-  for (i=[0:$children-1])
-  color(sheet_color) child(i);
-
-  if (id=="pcb")
-  for (i=[0:$children-1])
-  color(pcb_color) child(i);
-
-  if (id=="glass")
-  for (i=[0:$children-1])
-  color(glass_color) child(i);
-
-  if (id=="ABS")
-  for (i=[0:$children-1])
-  color(ABS_color) child(i);
-
-  if (id=="PLA")
-  for (i=[0:$children-1])
-  color(PLA_color) child(i);
-
-  if (id=="metal")
-  for (i=[0:$children-1])
-  color(metal_color) child(i);
-
-  if (id=="threaded metal")
-  for (i=[0:$children-1])
-  color(threaded_metal_color) child(i);
-
-  if (id=="rubber")
-  for (i=[0:$children-1])
-  color(rubber_color) child(i);
-
-  if (id=="peek")
-  for (i=[0:$children-1])
-  color(peek_color) child(i);
-
-  if (id=="nylon")
-  for (i=[0:$children-1])
-  color(nylon_color) child(i);
+render_materials = [
+  "lasercut"];
 
-  if (id=="acrylic")
-  for (i=[0:$children-1])
-  color(acrylic_color) child(i);
+module material(id){
+  for (m=render_materials){
+    if (id==m){
+      if (id=="lasercut")
+      for (i=[0:$children-1])
+      color(sheet_color) child(i);
+
+      if (id=="pcb")
+      for (i=[0:$children-1])
+      color(pcb_color) child(i);
+
+      if (id=="glass")
+      for (i=[0:$children-1])
+      color(glass_color) child(i);
+
+      if (id=="ABS")
+      for (i=[0:$children-1])
+      color(ABS_color) child(i);
+
+      if (id=="PLA")
+      for (i=[0:$children-1])
+      color(PLA_color) child(i);
+
+      if (id=="metal")
+      for (i=[0:$children-1])
+      color(metal_color) child(i);
+
+      if (id=="threaded metal")
+      for (i=[0:$children-1])
+      color(threaded_metal_color) child(i);
+
+      if (id=="rubber")
+      for (i=[0:$children-1])
+      color(rubber_color) child(i);
+
+      if (id=="peek")
+      for (i=[0:$children-1])
+      color(peek_color) child(i);
+
+      if (id=="nylon")
+      for (i=[0:$children-1])
+      color(nylon_color) child(i);
+
+      if (id=="acrylic")
+      for (i=[0:$children-1])
+      color(acrylic_color) child(i);
+
+      if (id=="silk")
+      for (i=[0:$children-1])
+      color("white") child(i);
+
+      if (id=="golden")
+      for (i=[0:$children-1])
+      color("gold") child(i);
+    }
+  }
 }
 
 //subassembly rendering switches:
diff --git a/small_extruder_gear.scad b/small_extruder_gear.scad
index 0f050ad..8800c6a 100644
--- a/small_extruder_gear.scad
+++ b/small_extruder_gear.scad
@@ -21,6 +21,7 @@
 
 use <gears.scad>;
 include <BillOfMaterials.h>;
+include <render.h>;
 
 module motor_gear(teeth=11, shaft_diameter=5){
   BillOfMaterials(category="3D Printed", partname="Small Extruder Gear");
@@ -29,6 +30,7 @@ module motor_gear(teeth=11, shaft_diameter=5){
     BillOfMaterials("M3x8 grubscrew - TODO");
   }
 
+  material("ABS")
   render()
   translate([0,0,5])
   difference() {
diff --git a/spacer.scad b/spacer.scad
index 4078e0b..4b5cb96 100644
--- a/spacer.scad
+++ b/spacer.scad
@@ -17,7 +17,6 @@
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 include <spacer.h>;
-include <colors.h>;
 include <Metamaquina2.h>;
 include <BillOfMaterials.h>;
 
@@ -33,7 +32,7 @@ module double_M3_lasercut_spacer(){
 module M3_spacer(){
   BillOfMaterials("M3 Lasercut spacer");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   M3_spacer_face();
 }
@@ -57,7 +56,7 @@ module set_of_M3_spacers(w=4, h=4){
 module M4_spacer(){
   BillOfMaterials("M4 Lasercut spacer");
 
-  color(sheet_color)
+  material("lasercut")
   linear_extrude(height=thickness)
   M4_spacer_face();
 }
@@ -91,24 +90,20 @@ module hexspacer_32mm(){
 }
 
 module generic_hexspacer(D=8, d=m3_diameter, h=hexspacer_length){
-  if (render_metal){
-    color(metal_color)
-    linear_extrude(height=h)
-    difference(){
-      circle(r=D/2, $fn=6);
-      circle(r=d/2, $fn=20);
-    }
+  material("metal")
+  linear_extrude(height=h)
+  difference(){
+    circle(r=D/2, $fn=6);
+    circle(r=d/2, $fn=20);
   }
 }
 
 module generic_nylonspacer(D=8, d=m4_diameter, h=nylonspacer_length){
-  if (render_nylon){
-    color(white_nylon_color)
-    linear_extrude(height=h)
-    difference(){
-      circle(r=D/2, $fn=20);
-      circle(r=d/2, $fn=20);
-    }
+  material("nylon")
+  linear_extrude(height=h)
+  difference(){
+    circle(r=D/2, $fn=20);
+    circle(r=d/2, $fn=20);
   }
 }
 
diff --git a/washers.scad b/washers.scad
index fdc8aed..ad89dfd 100644
--- a/washers.scad
+++ b/washers.scad
@@ -20,7 +20,6 @@
 include <washers.h>;
 include <BillOfMaterials.h>;
 include <render.h>;
-include <colors.h>;
 
 module M3_washer(){
   BillOfMaterials("M3 washer");
@@ -51,13 +50,11 @@ module M8_mudguard_washer(){
 }
 
 module washer(washer_thickness, external_diameter, internal_diameter){
-  if (render_metal){
-    color(metal_color){
-      linear_extrude(height=washer_thickness)
-      difference(){
-        circle(r=external_diameter/2);
-        circle(r=internal_diameter/2);
-      }
+  material("metal"){
+    linear_extrude(height=washer_thickness)
+    difference(){
+      circle(r=external_diameter/2);
+      circle(r=internal_diameter/2);
     }
   }
 }