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Extruder motor goes crazy

ralfsteckralfsteck
in Extruder & Bed
Hi,

I have a strange problem: When I start a print, the printer goes through the steps of the start script (basically Homing, Autolevel, go to side and wait until everything is heated), but while it waits there, suddeenly the extruder motor starts to run frantically backwards. I have this issue with Slic3r and Cura gcodes, but not when I type the entries by hand in Repetier host. The running starts at about 150°C which fits to the #define EXT0_WAIT_RETRACT_TEMP 150. But it doesn't retract just a little bit but endless.

Can you please help before I start throwing things at the printer? Thanks in advance.




GCode:

G21 ; set units to millimeters G90 ; use absolute coordinates M107 ; Fan off
M140 S55 ; Bett heizen
G28 ; Endstops anfahren
G32 S0 ; Auto Bed Leveling
M104 S215 ; Start Extruder heizen
G1 X290 Y0 Z25 F5000 ; auf Warteposition
M190 S55 ; Warten auf Bett Endtemperatur
M109 S215 ; Warten auf Extruder Endtemp.
G92 E0 ; Extruder auf Null setzen

;Layer count: 120
;LAYER:0
M107
G0 F7800 X136.475 Y86.475 Z0.150
;TYPE:SKIRT
G1 F1800 X163.525 Y86.475 E0.57861
G1 X163.525 Y113.525 E1.15722
G1 X136.475 Y113.525 E1.73583
G1 X136.475 Y86.475 E2.31444
G0 F7800 X136.825 Y86.825
G1 F1800 X163.175 Y86.825 E2.87808
...

Terminal output from Octoprint: 
Send: N79 G21*36
Recv: ok 79
Send: N80 G90*40
Recv: ok 80
Send: N81 M107*28
Recv: ok 81
Send: N82 M140 S55*111
Recv: ok 82
Send: N83 G28*40
Recv: TargetBed:55
Recv: ok 83
Send: N84 G32 S0*103
Send: N0 M110 N0*125
Recv: X:300.00 Y:200.00 Z:255.621 E:0.0000
Recv: ok 84
Send: N1 M104 S215*98
Recv: Info:Autoleveling disabled
Communication timeout during printing, forcing a line
Send: N2 M105*37
Communication timeout during printing, forcing a line
Send: N3 M105*36
Communication timeout during printing, forcing a line
Send: N4 M105*35
Communication timeout during printing, forcing a line
Send: N5 M105*34
Communication timeout during printing, forcing a line
Send: N6 M105*33
Communication timeout during printing, forcing a line
Send: N7 M105*32
Recv: Z-probe:4.36 X:272.00 Y:170.00
Recv: Z-probe:5.65 X:42.00 Y:170.00
Recv: Z-probe:4.90 X:150.00 Y:20.00
Recv: Transformation matrix: 0.999984 0.000005 0.005601 0.000000 1.000000 -0.000957 -0.005601 0.000957 0.999984
Recv: Info:Autoleveling enabled
Recv: X:150.03 Y:19.99 Z:4.899 E:0.0000
Recv: ok
Send: N8 M105*47
Recv: ok 1
Send: N9 M105*46
Recv: TargetExtr0:215
Recv: ok 2
Send: N10 M105*22
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 3
Send: N11 M105*23
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 4
Send: N12 M105*20
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 5
Send: N13 M105*21
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 6
Send: N14 M105*18
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 7
Send: N15 M105*19
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 8
Send: N16 M105*16
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 9
Send: N17 M105*17
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 10
Send: N18 M105*30
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 11
Send: N19 M105*31
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 12
Send: N20 M105*21
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 13
Send: N21 M105*20
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 14
Send: N22 M105*23
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 15
Send: N23 M105*22
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 16
Send: N24 M105*17
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 17
Send: N25 M105*16
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 18
Send: N26 M105*19
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:0
Recv: ok 19
Send: N27 M105*18
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 20
Send: N28 M105*29
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 21
Send: N29 M105*28
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 22
Send: N30 M105*20
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 23
Send: N31 M105*21
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 24
Send: N32 M105*22
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 25
Send: N33 M105*23
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 26
Send: N34 M105*16
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 27
Send: N35 M105*17
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 28
Send: N36 M105*18
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 29
Send: N37 M105*19
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 30
Send: N38 G1 X290 Y0 Z25 F5000*7
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 31
Send: N39 M190 S55*98
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 32
Send: N40 M109 S215*90
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 33
Send: N41 G92 E0*114
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 34
Send: N42 M107*19
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 35
Send: N43 G0 F7800 X136.475 Y86.475 Z0.150*28
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 36
Send: N44 G1 F1800 X163.525 Y86.475 E0.57861*14
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 37
Send: N45 G1 X163.525 Y113.525 E1.15722*86
Recv: T:23.25 /215 B:54.98 /55 B@:93 @:255
Recv: ok 38
Send: N46 G1 X136.475 Y113.525 E1.73583*88
Recv: ok 39
Send: N47 G1 X136.475 Y86.475 E2.31444*111
Recv: ok 40
Send: N48 M105*27
Recv: TargetExtr0:215
Recv: T:103.37 /215 B:55.05 /55 B@:121 @:255
Recv: T:111.89 /215 B:55.11 /55 B@:87 @:255
Recv: T:121.44 /215 B:55.11 /55 B@:78 @:255
Recv: T:130.83 /215 B:55.11 /55 B@:169 @:255
Recv: T:140.13 /215 B:55.17 /55 B@:19 @:255
Recv: T:148.42 /215 B:55.11 /55 B@:141 @:255
Recv: T:157.35 /215 B:55.11 /55 B@:31 @:255
Unexpected error while reading serial port, please consult octoprint.log for details: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:1345

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