Merge pull request #18372 from Ultimaker/restore_geeetech_A20_1_extruder_definition

restore extruder definition

resources/extruders/geeetech_A20_1.def.json

@@ -0,0 +1,16 @@
+{
+    "version": 2,
+    "name": "Extruder 1",
+    "inherits": "fdmextruder",
+    "metadata":
+    {
+        "machine": "geeetech_A20",
+        "position": "0"
+    },
+    "overrides":
+    {
+        "extruder_nr": { "default_value": 0 },
+        "machine_nozzle_size": { "default_value": 0.4 },
+        "material_diameter": { "default_value": 1.75 }
+    }
+}