Yes it makes sense Thank you

By the way, it's a machine similar

One of my friends sent this file and when I print it is okay
I can't see what's wrong

0_1555150796397_infinityheart.gcode

; homeall.g
; called to home all axes
;
; generated by RepRapFirmware Configuration Tool on Tue Jun 06 2017 22:17:43 GMT+0200 (Rom, sommertid)

; Relative positioning
G91

; Lift Z
G1 Z5 F4000 S2

; Course home X and Y
G1 X-305 Y-305 F1800 S1

; Move away from the endstops
G1 X5 Y5 F6000 S2

; Fine home X and Y
G1 X-305 Y-305 F360 S1

; Absolute positioning
G90

G1 Z-275 F800 S1

G91
G1 Z5 F1800 S2
G90

;mowe slowly to z axis endstop once more (secone pass)
G1 Z-275 F360 S1

; Go to first bed probe point and home Z
;G1 X15 Y15 F4000
;G30

; Uncomment the following line to lift the nozzle after probing
;G1 Z5 F100

Here's my start script, something that's not necessary

G28 ; home all axes
G91
G1 Z5 F1800
G90
G1 Z-275 F40 S1; Move slowly to Z axis endstop once more (second pass)
G1 X0 Y5 Z0.2 F3000 ; get ready to prime
G92 E0 ; reset extrusion distance
G1 X250 E20 F600 ; prime nozzle

0_1554986915742_Afstand stykke 7mm 1Stk.gcode

layer 0,200
Simplify3D-4.1.2
It has just come by itself
A print of about 5 min
It's on every print it does

https://vimeo.com/329770517

Why does it do it

My filament extrudes 96 mm when it's going to run 50 mm, how do I change it

can it be used

Firmware Electronics: Duet WiFi 1.0
Firmware Version: 1.18.1 (2017-04-09)
WiFi Server Version: 1.03 (ch fork)
Web Interface Version: 1.15a