New --before-layer-change option and new layer_z placeholder. #2602

README.md

@@ -219,7 +219,8 @@ The author of the Silk icon set is Mark James.
         --end-gcode         Load final G-code from the supplied file. This will overwrite
                             the default commands (turn off temperature [M104 S0],
                             home X axis [G28 X], disable motors [M84]).
-        --layer-gcode       Load layer-change G-code from the supplied file (default: nothing).
+        --before-layer-gcode  Load before-layer-change G-code from the supplied file (default: nothing).
+        --layer-gcode       Load after-layer-change G-code from the supplied file (default: nothing).
         --toolchange-gcode  Load tool-change G-code from the supplied file (default: nothing).
         --seam-position     Position of loop starting points (random/nearest/aligned, default: aligned).
         --external-perimeters-first Reverse perimeter order. (default: no)

lib/Slic3r/GUI/Tab.pm

@@ -945,7 +945,7 @@ sub build {
         octoprint_host octoprint_apikey
         use_firmware_retraction pressure_advance vibration_limit
         use_volumetric_e
-        start_gcode end_gcode layer_gcode toolchange_gcode
+        start_gcode end_gcode before_layer_gcode layer_gcode toolchange_gcode
         nozzle_diameter extruder_offset
         retract_length retract_lift retract_speed retract_restart_extra retract_before_travel retract_layer_change wipe
         retract_length_toolchange retract_restart_extra_toolchange
@@ -1110,7 +1110,16 @@ sub build {
             $optgroup->append_single_option_line($option);
         }
         {
-            my $optgroup = $page->new_optgroup('Layer change G-code',
+            my $optgroup = $page->new_optgroup('Before layer change G-code',
+                label_width => 0,
+            );
+            my $option = $optgroup->get_option('before_layer_gcode');
+            $option->full_width(1);
+            $option->height(150);
+            $optgroup->append_single_option_line($option);
+        }
+        {
+            my $optgroup = $page->new_optgroup('After layer change G-code',
                 label_width => 0,
             );
             my $option = $optgroup->get_option('layer_gcode');

lib/Slic3r/Print/GCode.pm

@@ -318,9 +318,14 @@ sub process_layer {
     }
 
     # set new layer - this will change Z and force a retraction if retract_layer_change is enabled
+    $gcode .= $self->_gcodegen->placeholder_parser->process($self->print->config->before_layer_gcode, {
+        layer_num => $layer->id,
+        layer_z   => $layer->print_z,
+    }) . "\n" if $self->print->config->before_layer_gcode;
     $gcode .= $self->_gcodegen->change_layer($layer);
     $gcode .= $self->_gcodegen->placeholder_parser->process($self->print->config->layer_gcode, {
         layer_num => $layer->id,
+        layer_z   => $layer->print_z,
     }) . "\n" if $self->print->config->layer_gcode;
 
     # extrude skirt

slic3r.pl

@@ -371,6 +371,7 @@ sub usage {
     --end-gcode         Load final G-code from the supplied file. This will overwrite 
                         the default commands (turn off temperature [M104 S0],
                         home X axis [G28 X], disable motors [M84]).
+    --before-layer-gcode  Load before-layer-change G-code from the supplied file (default: nothing).
     --layer-gcode       Load layer-change G-code from the supplied file (default: nothing).
     --toolchange-gcode  Load tool-change G-code from the supplied file (default: nothing).
     --seam-position     Position of loop starting points (random/nearest/aligned, default: $config->{seam_position}).

xs/src/libslic3r/PrintConfig.cpp

@@ -22,6 +22,14 @@ PrintConfigDef::build_def() {
     Options["bed_temperature"].min = 0;
     Options["bed_temperature"].max = 300;
 
+    Options["before_layer_gcode"].type = coString;
+    Options["before_layer_gcode"].label = "Before layer change G-code";
+    Options["before_layer_gcode"].tooltip = "This custom code is inserted at every layer change, right before the Z move. Note that you can use placeholder variables for all Slic3r settings as well as [layer_num] and [layer_z].";
+    Options["before_layer_gcode"].cli = "before-layer-gcode=s";
+    Options["before_layer_gcode"].multiline = true;
+    Options["before_layer_gcode"].full_width = true;
+    Options["before_layer_gcode"].height = 50;
+
     Options["bottom_solid_layers"].type = coInt;
     Options["bottom_solid_layers"].label = "Bottom";
     Options["bottom_solid_layers"].category = "Layers and Perimeters";
@@ -438,9 +446,9 @@ PrintConfigDef::build_def() {
     Options["interface_shells"].category = "Layers and Perimeters";
 
     Options["layer_gcode"].type = coString;
-    Options["layer_gcode"].label = "Layer change G-code";
-    Options["layer_gcode"].tooltip = "This custom code is inserted at every layer change, right after the Z move and before the extruder moves to the first layer point. Note that you can use placeholder variables for all Slic3r settings.";
-    Options["layer_gcode"].cli = "layer-gcode=s";
+    Options["layer_gcode"].label = "After layer change G-code";
+    Options["layer_gcode"].tooltip = "This custom code is inserted at every layer change, right after the Z move and before the extruder moves to the first layer point. Note that you can use placeholder variables for all Slic3r settings as well as [layer_num] and [layer_z].";
+    Options["layer_gcode"].cli = "after-layer-gcode|layer-gcode=s";
     Options["layer_gcode"].multiline = true;
     Options["layer_gcode"].full_width = true;
     Options["layer_gcode"].height = 50;

xs/src/libslic3r/PrintConfig.hpp

@@ -324,6 +324,7 @@ class PrintRegionConfig : public virtual StaticPrintConfig
 class GCodeConfig : public virtual StaticPrintConfig
 {
     public:
+    ConfigOptionString              before_layer_gcode;
     ConfigOptionString              end_gcode;
     ConfigOptionString              extrusion_axis;
     ConfigOptionFloats              extrusion_multiplier;
@@ -346,6 +347,7 @@ class GCodeConfig : public virtual StaticPrintConfig
     ConfigOptionBool                use_volumetric_e;
 
     GCodeConfig() : StaticPrintConfig() {
+        this->before_layer_gcode.value                           = "";
         this->end_gcode.value                                    = "M104 S0 ; turn off temperature\nG28 X0  ; home X axis\nM84     ; disable motors\n";
         this->extrusion_axis.value                               = "E";
         this->extrusion_multiplier.values.resize(1);
@@ -377,6 +379,7 @@ class GCodeConfig : public virtual StaticPrintConfig
     };
 
     ConfigOption* option(const t_config_option_key opt_key, bool create = false) {
+        if (opt_key == "before_layer_gcode")                         return &this->before_layer_gcode;
         if (opt_key == "end_gcode")                                  return &this->end_gcode;
         if (opt_key == "extrusion_axis")                             return &this->extrusion_axis;
         if (opt_key == "extrusion_multiplier")                       return &this->extrusion_multiplier;