Setting to put thumbnails at the end of the gcode file

Note that no firmware/printer support that right now.

resources/ui_layout/printer_fff.ui

@@ -28,8 +28,8 @@ group:silent_mode_event:Firmware
 	end_line
 	setting:gcode_filename_illegal_char
 group:Cooling fan
-	line:Speedup
-		setting:label$Speedup time:fan_speedup_time
+	line:Speedup time
+		setting:label$:fan_speedup_time
 		setting:label$Only for overhangs:fan_speedup_overhangs
 	end_line
 	setting:label$Kickstart duration:fan_kickstart
@@ -43,7 +43,10 @@ group:Thumbnails
 		setting:label$:sidetext_width$1:thumbnails_custom_color
 		setting:label$:label_width$1:thumbnails_color
 	end_line
-	setting:thumbnails_with_bed
+	line:Thumbnail options
+		setting:thumbnails_with_bed
+		setting:thumbnails_end_file
+	end_line
 group:Advanced
 	setting:use_relative_e_distances
 	setting:use_firmware_retraction

src/libslic3r/GCode.cpp

@@ -1169,12 +1169,15 @@ void GCode::_do_export(Print& print, FILE* file, ThumbnailsGeneratorCallback thu
     _write_format(file, "; %s\n\n", Slic3r::header_slic3r_generated().c_str());
 
 
-    const ConfigOptionBool *thumbnails_with_bed = print.full_print_config().option<ConfigOptionBool>("thumbnails_with_bed");
-    DoExport::export_thumbnails_to_file(thumbnail_cb, 
-        print.full_print_config().option<ConfigOptionPoints>("thumbnails")->values,
-        thumbnails_with_bed==nullptr? false:thumbnails_with_bed->value,
-        [this, file](const char* sz) { this->_write(file, sz); }, 
-        [&print]() { print.throw_if_canceled(); });
+    //print thumbnails at the start unless requested at the end.
+    const ConfigOptionBool* thumbnails_with_bed = print.full_print_config().option<ConfigOptionBool>("thumbnails_with_bed");
+    const ConfigOptionBool* thumbnails_end_file = print.full_print_config().option<ConfigOptionBool>("thumbnails_end_file");
+    if(!thumbnails_end_file || !thumbnails_end_file->value)
+        DoExport::export_thumbnails_to_file(thumbnail_cb, 
+            print.full_print_config().option<ConfigOptionPoints>("thumbnails")->values,
+            thumbnails_with_bed==nullptr? false:thumbnails_with_bed->value,
+            [this, file](const char* sz) { this->_write(file, sz); }, 
+            [&print]() { print.throw_if_canceled(); });
 
     // Write notes (content of the Print Settings tab -> Notes)
     {
@@ -1676,6 +1679,15 @@ void GCode::_do_export(Print& print, FILE* file, ThumbnailsGeneratorCallback thu
             _write(file, full_config, true);
     }
     print.throw_if_canceled();
+
+    //print thumbnails at the end instead of the start if requested
+    if (thumbnails_end_file && thumbnails_end_file->value)
+        DoExport::export_thumbnails_to_file(thumbnail_cb,
+            print.full_print_config().option<ConfigOptionPoints>("thumbnails")->values,
+            thumbnails_with_bed == nullptr ? false : thumbnails_with_bed->value,
+            [this, file](const char* sz) { this->_write(file, sz); },
+            [&print]() { print.throw_if_canceled(); });
+    print.throw_if_canceled();
 }
 
 std::string GCode::placeholder_parser_process(const std::string &name, const std::string &templ, uint16_t current_extruder_id, DynamicConfig *config_override)

src/libslic3r/Preset.cpp

@@ -757,6 +757,7 @@ const std::vector<std::string>& Preset::printer_options()
             "thumbnails",
             "thumbnails_color",
             "thumbnails_custom_color",
+            "thumbnails_end_file",
             "thumbnails_with_bed",
             "wipe_advanced",
             "wipe_advanced_nozzle_melted_volume",

src/libslic3r/PrintConfig.cpp

@@ -97,6 +97,13 @@ void PrintConfigDef::init_common_params()
     def->mode = comExpert;
     def->set_default_value(new ConfigOptionBool(false));
 
+    def = this->add("thumbnails_end_file", coBool);
+    def->label = L("Print at the end");
+    def->tooltip = L("Print the thumbnail code at the end of the gcode file instead of the front."
+        "\nBe careful! Most firmwares expect it at the front, so be sure that your firmware support it.");
+    def->mode = comExpert;
+    def->set_default_value(new ConfigOptionBool(false)); 
+
     def = this->add("thumbnails_with_bed", coBool);
     def->label = L("Bed on thumbnail");
     def->tooltip = L("Show the bed texture on the thumbnail picture.");
@@ -5914,6 +5921,7 @@ std::unordered_set<std::string> prusa_export_to_remove_keys = {
 "thin_walls_speed",
 "thumbnails_color",
 "thumbnails_custom_color",
+"thumbnails_end_file",
 "thumbnails_with_bed",
 "thumbnails_with_support",
 "time_estimation_compensation",

src/libslic3r/PrintConfig.hpp

@@ -1379,6 +1379,7 @@ public:
     ConfigOptionPoints              thumbnails;
     ConfigOptionString              thumbnails_color;
     ConfigOptionBool                thumbnails_custom_color;
+    ConfigOptionBool                thumbnails_end_file;
     ConfigOptionBool                thumbnails_with_bed;
     ConfigOptionPercent             time_estimation_compensation;
     ConfigOptionInts                top_fan_speed;
@@ -1482,6 +1483,7 @@ protected:
         OPT_PTR(thumbnails);
         OPT_PTR(thumbnails_color);
         OPT_PTR(thumbnails_custom_color);
+        OPT_PTR(thumbnails_end_file);
         OPT_PTR(thumbnails_with_bed);
         OPT_PTR(time_estimation_compensation);
         OPT_PTR(top_fan_speed);

src/libslic3r/SLAPrint.cpp

@@ -856,6 +856,7 @@ bool SLAPrint::invalidate_state_by_config_options(const std::vector<t_config_opt
         "thumbnails",
         "thumbnails_color",
         "thumbnails_custom_color",
+        "thumbnails_end_file",
         "thumbnails_with_bed",
         "thumbnails_with_support"
     };