Geeetech

Thankyou for help.
I' ve finally find the trouble.
There was a cold weld on the connector from rumba to driver on the E cable.
Sometimes work and sometimes not. Depend from the position of cable.
I have verified it with a tester, I made new weld and now all working good ......
Sorry for lose time ...

I have more than 180 degrees.
I also don't have the warning message of cold extrude during manual operation.
I can see the string "G1 E100 F1200" every time I push the video button of manual extrusion on repetier host screen.
In print mode, I'm awaiting until the extruder becomes hot, then the print ...

I've got a Rumba.
My rumba works with external bigger drivers, because my printer is a old retrofitted CNC macine.
I've load Marlin Firmaware on my Rumba: echo:Marlin1.0.0
FIRMWARE_NAME:Marlin V1; Sprinter/grbl mashup for gen6 FIRMWARE_URL:https://github.com/ErikZalm/Marlin/ PROTOCOL_VERSION:1.0 ...