diff --git a/resources/definitions/fdmprinter.def.json b/resources/definitions/fdmprinter.def.json
index ed6a5e5286..c79b025f3f 100644
--- a/resources/definitions/fdmprinter.def.json
+++ b/resources/definitions/fdmprinter.def.json
@@ -228,13 +228,23 @@
                 "machine_heat_zone_length":
                 {
                     "label": "Heat zone length",
-                    "description": "The distance from the tip of the nozzle in which heat from the nozzle is transfered to the filament.",
+                    "description": "The distance from the tip of the nozzle in which heat from the nozzle is transferred to the filament.",
                     "default_value": 16,
                     "type": "float",
                     "settable_per_mesh": false,
                     "settable_per_extruder": true,
                     "settable_per_meshgroup": false
                 },
+                "machine_cool_zone_length":
+                {
+                    "label": "Cool Zone Length",
+                    "description": "The length of the piece that dissipates heat from the hot end to shield heat-sensitive equipment.",
+                    "default_value": 0,
+                    "type": "float",
+                    "settable_per_mesh": false,
+                    "settable_per_extruder": true,
+                    "settable_per_meshgroup": false
+                },
                 "machine_nozzle_heat_up_speed":
                 {
                     "label": "Heat up speed",
@@ -990,7 +1000,7 @@
                     "unit": "mm",
                     "type": "float",
                     "default_value": 100.0,
-                    "value": "machine_depth / 2",
+                    "value": "machine_depth * 3",
                     "enabled": "z_seam_type == 'back'",
                     "settable_per_mesh": true
                 },
diff --git a/resources/definitions/ultimaker3.def.json b/resources/definitions/ultimaker3.def.json
index ae0966242d..dc8f70cadd 100644
--- a/resources/definitions/ultimaker3.def.json
+++ b/resources/definitions/ultimaker3.def.json
@@ -38,6 +38,7 @@
         "machine_depth": { "default_value": 215 },
         "machine_height": { "default_value": 200 },
         "machine_heated_bed": { "default_value": true },
+        "machine_cool_zone_length": { "default_value": 26.5 },
         "machine_nozzle_heat_up_speed": { "default_value": 1.4 },
         "machine_nozzle_cool_down_speed": { "default_value": 0.8 },
         "machine_head_with_fans_polygon":