diff --git a/resources/definitions/mendel90.def.json b/resources/definitions/mendel90.def.json
index 104ca7f42f..85d82ae176 100644
--- a/resources/definitions/mendel90.def.json
+++ b/resources/definitions/mendel90.def.json
@@ -5,7 +5,7 @@
     "metadata":
     {
         "visible": true,
-        "author": "Bo Herrmannsen",
+        "author": "Wilmer Gaona",
         "manufacturer": "Nophead",
         "file_formats": "text/x-gcode",
         "platform": "mendel90_platform.stl",
@@ -23,10 +23,10 @@
     "overrides": {
         "machine_name": { "default_value": "Mendel90" },
         "machine_start_gcode": {
-            "default_value": "G21 ;metric values\nG90 ;absolute positioning\nG92 E0 ;zero the extruded length\nM107 ;start with the fan off\nG1 X90 Y200 F6000 ;go to the middle of the front\nG1 Z0.05 ;close to the bed\nG1 Z0.3 ;lift Z\n"
+            "default_value": "G21 ;metric values\nG90 ;absolute positioning\nM82 ;absolute extrusion\nM107 ;start with the fan off\nG28 ;home\nG92 E0 ;zero the extruded length\nM140 S{material_bed_temperature_layer_0} ; set the bed temperature and continue on\nG1 X-50 Y98 F9000 ;go to the left of the top\nG1 Z0.05 ; close to the bed\nM104 S{material_print_temperature_layer_0}; pre-heat the extruder continue on\nM190 S{material_bed_temperature_layer_0} ;set the bed temp & wait\nM109 S{material_print_temperature_layer_0};set the extruder temp for layer 0 & wait\nG92 E0 ;zero the extruded length\nG1 X50 E10 F300 ; make a thick line to prime extruder\nG92 E0 ; reset extruder\nG1 E-4 F1800\nG1 Z0.3 ;lift Z\n"
         },
         "machine_end_gcode": {
-            "default_value": "M104 S0 ;extruder heater off\nM140 S0 ;heated bed heater off (if you have it)\nM107 ;carriage fan off\nG91 ;relative positioning\nG1 Z10 ;Move up Z 10mm\nG90 ;back to absolute mode\nG1 E-1 F1200 ;retract the filament a bit before lifting the nozzle, to release some of the pressure\nG92 E0 ;zero the extruded length\nG1 Y200 F5000 ;Move Y to middle of bed cooling fan\nM42 P42 S255 ;Turn on Bed cooling fan on\nG4 S420 ;Wait 7 mins\nM42 P42 S0 ;Turn off bed cooling fan\nG1 Y10 F5000 ;Move Y to front\nM84 ;steppers off\n"
+            "default_value": "M104 S0 ;extruder heater off\nM140 S0 ;heated bed heater off (if you have it)\nM107 ;carriage fan off\nG91 ;relative positioning\nG1 Z10 ;Move up Z 10mm\nG90 ;back to absolute mode\nG1 E-1 F1200 ;retract the filament a bit before lifting the nozzle, to release some of the pressure\nG92 E0 ;zero the extruded length\nG1 Z200 X-100 F9000 ; go to top\nG1 Y100 F5000 ;Move Y to back\nM42 P42 S255 ;Turn on Bed cooling fan on\nG4 S10 ;Wait 10 seconds\nM42 P42 S0 ;Turn off bed cooling fan\nM84 ;steppers off\n"
         },
         "material_bed_temp_wait": {
             "default_value": true
@@ -47,7 +47,7 @@
             "default_value": true
         },
         "machine_center_is_zero": {
-            "default_value": false
+            "default_value": true
         },
         "machine_extruder_count": {
             "default_value": 1