Initial commit.

upgrades/replicator/.gitignore

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+*.stl
+*.gcode
+

upgrades/replicator/vent_channels.scad

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+// Vent channels to pass air over stepper motors from electronics fan.
+
+//render_part="channel_section_2d";
+//render_part="channel_inner_mask_2d";
+render_part="channel_section";
+
+vent_xy=29.82; // From laser cut DXF source files
+vent2stepper=186.5;
+
+channel_th=2.0; // Channel wall thickness
+
+module channel_section_2d(vent_xy=vent_xy,channel_th=channel_th) {
+  hull() {
+    translate([0,vent_xy-channel_th]) square([channel_th,2*channel_th],center=false);
+    translate([vent_xy-channel_th,0]) square([2*channel_th,channel_th],center=false);
+  }
+  hull() {
+    translate([0,vent_xy/2]) square([channel_th,channel_th],center=false);
+    translate([0,vent_xy]) square([channel_th,channel_th],center=false);
+  }
+  hull() {
+    translate([vent_xy/2,0]) square([channel_th,channel_th],center=false);
+    translate([vent_xy,0]) square([channel_th,channel_th],center=false);
+  }
+}
+
+if(render_part=="channel_section_2d") {
+  echo("Rendering channel_section_2d()...");
+  channel_section_2d();
+}
+
+module channel_inner_mask_2d(vent_xy=vent_xy,channel_th=channel_th) {
+  polygon(points=[ [0,0],[0,vent_xy],[vent_xy,0] ],paths=[[0,1,2]]);
+}
+
+if(render_part=="channel_inner_mask_2d") {
+  echo("Rendering channel_inner_mask_2d()...");
+  channel_inner_mask_2d();
+}
+
+module channel_section(h=60.0,vent_xy=vent_xy,channel_th=channel_th) {
+  difference() {
+    union() {
+      linear_extrude(height=h) render() channel_section_2d(vent_xy=vent_xy,channel_th=channel_th);
+      translate([0,0,h-2*channel_th]) linear_extrude(height=3*channel_th) render() intersection() {
+	  channel_section_2d(vent_xy=vent_xy,channel_th=2*channel_th);
+	  channel_inner_mask_2d(vent_xy=vent_xy,channel_th=channel_th);
+	  translate([channel_th,channel_th]) channel_inner_mask_2d(vent_xy=vent_xy-channel_th,channel_th=channel_th);
+      }
+    }
+    translate([0,0,-channel_th]) linear_extrude(height=2*channel_th) render() intersection() {
+	channel_section_2d(vent_xy=vent_xy,channel_th=2*channel_th);
+	channel_inner_mask_2d(vent_xy=vent_xy,channel_th=channel_th);
+	translate([channel_th,channel_th]) channel_inner_mask_2d(vent_xy=vent_xy-channel_th,channel_th=channel_th);
+    }
+  }
+}
+
+if(render_part=="channel_section") {
+  echo("Rendering channel_section()...");
+  for(i=[0:3]) rotate([0,0,i*360/4]) translate([channel_th,channel_th,0]) 
+    channel_section();
+}
+