It worked fine. Thank you guys for the help!

Great, Thank You!
Will try and leave a feedback.

; feature gap fill
G1 X102.498 Y236.792 F4800
G1 X102.607 Y236.683 E33774.7533 F640
G1 X103.166 Y236.804 E33774.7807
G1 X102.837 Y237.132 E33774.8029
G1 E33773.8029 F1800
; layer 291, Z = 87.450
; feature outer perimeter
G1 Z87.450 F1000
G1 X103.205 Y237.811 F4800
G1 E33774.8029 F1800
G1 X102.032 Y236.636 E33774.8824 F384
G1 X103.964 Y237.053 E33774.9771
G1 X103.205 Y237.811 E33775.0285
G1 E33774.0285 F1800
; layer 292, Z = 87.750
G1 Z87.750 F1000
G1 X103.321 Y237.694 F4800
G1 E33775.0285 F1800
G1 X102.926 Y237.298 E33775.0553 F384
G1 X103.577 Y237.439 E33775.0872
G1 X103.321 Y237.694 E33775.1045
G1 E33774.1045 F1800
; layer end
M104 S0 T0 ; turn off right extruder
M140 S0 T1 ; turn off bed
G1 S2 Z5 F100 ;
G1 S1 X-205 F1200;
G1 S1 Y-265 F1200;
M84 ; disable motors

These are the last lines.

I just checked. Nope seems to be correct:
.
.
.
; layer end
M104 S0 T0 ; turn off right extruder
M140 S0 T1 ; turn off bed
G1 S2 Z5 F100 ;
G1 S1 X-205 F1200;
G1 S1 Y-265 F1200;
at the end of the File.
And positive Z in Down not up on my movable Printbed. Works with all other Perimeters too. So no Idea what he is doing, from my side...

Also he doesnt Home X and Y as commanded, he just raises Z instantly after the last Print step.

Thanks. But I already checked that. Added: in Slicer:
M104 S0 T0 ; turn off right extruder
M140 S0 T1 ; turn off bed
G1 S2 Z5 F100 ;
G1 S1 X-205 F1200;
G1 S1 Y-265 F1200;
M84 ; disable motors

So doesnt seems to be the Problem. Could it be some routine at the DUET Board?

Hey Guys,
I have recently changed the Board on my Leapfrog CREATR to a DUET 3D Ethernet, and the Extruder. For Slicing I use SIMPLYFY3D.
Everything is Setup and works fine. Only Problem is, that after finishing the Print, the Printing Plate wants to rise, so that the Hot End runs into the Part. I was not able to find the routine, neither in the Slicing Software, nor in the Confoguration Files of DUET3D which are causing this. Any Ideas?
THX