@dc42 it is Cartesian type!

@Phaedrux So I need to change "G90 ; absolute positioning G1 X0 Y0 ; move to x0 y0" in my end G code?

@OwenD thank you! I'll try and tell you the result!

@OwenD M121
M107
M104 S0 ;extruder heater off
M140 S0 ;heated bed heater off (if you have it)
G91 ;relative positioning
G1 E-1 F300 ;retract the filament a bit before lifting the nozzle to release some of the pressure
G1 Z+0.5 E-5 F{travel_speed} ;move Z up a bit and retract filament even more
G28 X0 Y0 ;move X/Y to min endstops so the head is out of the way
M84 ;steppers offngontan
G90
this end G code work fine with Arduino mega 2560 and ramp 1.6! but with duet it not working! it only hit the model!

@OwenD said in Extruder hit the model after print job is done:

It won't do anything not commanded.
It's not normal to home after a print.
You need to post the files listed above and perhaps the gcode you are printing.

ok! I''ll show you the end of file!

@OwenD I don't add start and end G code in cura, I think it must auto home all axis and avoid hit the model? is it right?

@OwenD I'm using Cura! I don't know where are start.g and stop.g? can you show me where they are!? many thank

I'm using Duet 2 wifi, everything work perfect but only one problem. When print job is done, extrucder right away go down and hit the model, broken it! I think it must home all X Y Z axis but it alway go down and hit the model? Anybody have same problem and can help me fix this! many thank!