add Snapmaker 2.0 Dual Extruder Definitions

resources/definitions/snapmaker2_A150_dual.def.json

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+{
+    "version": 2,
+    "name": "Snapmaker 2 A150 Dual Extruder",
+    "inherits": "snapmaker2_dual",
+    "metadata":
+    {
+        "visible": true,
+        "manufacturer": "Snapmaker",
+        "file_formats": "text/x-gcode",
+        "machine_extruder_trains":
+        {
+            "0": "snapmaker_dual_extruder_0",
+            "1": "snapmaker_dual_extruder_1"
+        },
+        "quality_definition": "snapmaker2"
+    },
+    "overrides":
+    {
+        "gantry_height": { "value": 27 },
+        "machine_depth": { "default_value": 160 },
+        "machine_head_with_fans_polygon":
+        {
+            "default_value": [
+                [-67, 22],
+                [-67, -25],
+                [25.5, 22],
+                [25.5, -25]
+            ]
+        },
+        "machine_height": { "default_value": 145 },
+        "machine_name": { "default_value": "Snapmaker A150" },
+        "machine_width": { "default_value": 160 }
+    }
+}

resources/definitions/snapmaker2_A250_dual.def.json

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+{
+    "version": 2,
+    "name": "Snapmaker 2 A250 Dual Extruder",
+    "inherits": "snapmaker2_dual",
+    "metadata":
+    {
+        "visible": true,
+        "manufacturer": "Snapmaker",
+        "file_formats": "text/x-gcode",
+        "machine_extruder_trains": {
+            "0": "snapmaker_dual_extruder_0",
+            "1": "snapmaker_dual_extruder_1"
+        },
+        "quality_definition": "snapmaker2"
+    },
+    "overrides":
+    {
+        "gantry_height": { "value": 27 },
+        "machine_depth": { "default_value": 250 },
+        "machine_head_with_fans_polygon":
+        {
+            "default_value": [
+                [-67, 22],
+                [-67, -25],
+                [25.5, 22],
+                [25.5, -25]
+            ]
+        },
+        "machine_height": { "default_value": 235 },
+        "machine_name": { "default_value": "Snapmaker A250" },
+        "machine_width": { "default_value": 230 }
+    }
+}

resources/definitions/snapmaker2_A350_dual.def.json

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+{
+    "version": 2,
+    "name": "Snapmaker 2 A350 Dual Extruder",
+    "inherits": "snapmaker2_dual",
+    "metadata":
+    {
+        "visible": true,
+        "manufacturer": "Snapmaker",
+        "file_formats": "text/x-gcode",
+        "machine_extruder_trains":
+        {
+            "0": "snapmaker_dual_extruder_0",
+            "1": "snapmaker_dual_extruder_1"
+            
+        },
+        "quality_definition": "snapmaker2"
+    },
+    "overrides":
+    {
+        "gantry_height": { "value": 27 },
+        "machine_depth": { "default_value": 350 },
+        "machine_head_with_fans_polygon":
+        {
+            "default_value": [
+                [-67, 22],
+                [-67, -25],
+                [25.5, 22],
+                [25.5, -25]
+            ]
+        },
+        "machine_height": { "default_value": 330 },
+        "machine_name": { "default_value": "Snapmaker A350" },
+        "machine_width": { "default_value": 320 }
+    }
+}

resources/definitions/snapmaker2_dual.def.json

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+{
+    "version": 2,
+    "name": "Snapmaker 2",
+    "inherits": "fdmprinter",
+    "metadata":
+    {
+        "visible": false,
+        "manufacturer": "Snapmaker",
+        "file_formats": "text/x-gcode",
+        "exclude_materials": [],
+        "has_machine_quality": true,
+        "has_materials": true,
+        "machine_extruder_trains":
+        {
+            "0": "snapmaker_dual_extruder_0",
+            "1": "snapmaker_dual_extruder_1"
+        },
+        "preferred_material": "generic_pla",
+        "preferred_quality_type": "normal"
+    },
+    "overrides":
+    {
+        "default_material_print_temperature": { "default_value": 205 },
+        "machine_acceleration": { "default_value": 1000 },
+        "machine_buildplate_type": { "default_value": "aluminum" },
+        "machine_end_gcode": { "default_value": "M104 S0 ;Extruder heater off\nM140 S0 ;Heated bed heater off\nG90 ;absolute positioning\nG92 E0 ;Retract the filament\nG1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure\nG1 Z{machine_height} E-1 F3000 ;move Z up a bit and retract filament even more\nG1 X0 F3000 ;move X to min endstops, so the head is out of the way\nG1 Y{machine_depth} F3000 ;so the head is out of the way and Plate is moved forward" },
+        "machine_extruder_count": { "default_value": 2 },
+        "machine_heated_bed": { "default_value": true },
+        "machine_max_acceleration_e": { "default_value": 1000 },
+        "machine_max_acceleration_x": { "default_value": 1000 },
+        "machine_max_acceleration_y": { "default_value": 1000 },
+        "machine_max_acceleration_z": { "default_value": 1000 },
+        "machine_name": { "default_value": "Snapmaker" },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "machine_start_gcode": { "default_value": "M104 S{material_print_temperature_layer_0} ;Set Hotend Temperature\nM140 S{material_bed_temperature_layer_0} ;Set Bed Temperature\nG28 ;home\nG90 ;absolute positioning\nG1 X-10 Y-10 F3000 ;Move to corner \nG1 Z0 F1800 ;Go to zero offset\nM109 S{material_print_temperature_layer_0} ;Wait for Hotend Temperature\nM190 S{material_bed_temperature_layer_0} ;Wait for Bed Temperature\nG92 E0 ;Zero set extruder position\nG1 E20 F200 ;Feed filament to clear nozzle\nG92 E0 ;Zero set extruder position" },
+        "material_bed_temp_prepend": { "default_value": false },
+        "material_diameter": { "default_value": 1.75 },
+        "material_print_temp_prepend": { "default_value": false },
+        "retract_at_layer_change": { "default_value": false },
+        "retraction_amount": { "default_value": 5 },
+        "retraction_enable": { "default_value": true },
+        "retraction_speed": { "default_value": 60 }
+    }
+}

resources/extruders/snapmaker_dual_extruder_0.def.json

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+{
+    "version": 2,
+    "name": "Extruder Left",
+    "inherits": "fdmextruder",
+    "metadata":
+    {
+        "machine": "snapmaker2_dual",
+        "position": "1"
+    },
+    "overrides":
+    {
+        "extruder_nr":
+        {
+            "default_value": 0,
+            "maximum_value": "1"
+            
+        },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+    }
+}

resources/extruders/snapmaker_dual_extruder_1.def.json

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+{
+    "version": 2,
+    "name": "Extruder Right",
+    "inherits": "fdmextruder",
+    "metadata":
+    {
+        "machine": "snapmaker2_dual",
+        "position": "1"
+    },
+    "overrides":
+    {
+        "extruder_nr":
+        {
+            "default_value": 1,
+            "maximum_value": "1"
+            
+        },
+        "machine_extruder_cooling_fan_number": { "default_value": 1 },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+    }
+}