Dualextruder Coasting Error

[doublehelix]

Hello,

I've a problem with S3D and my dualextruder setup. Whenever one of the extruders is printing the extruder motor starts to coast(stopp moving in the middle of the layer) allthough coasting is deactivated. If there is full infill like the first 3 layers, there is no problem. It also hapens for the skirt layer is I set ist to "all extruders". If I let just print 1 extruder all works fine. I've made one ff profile with both extruders and their temperatures dialed in. Some things I can rule out:

• low temperature
• too high stepper voltage
• nozzle clogging

Here is a Gcode of a testprint.

http://filehorst.de/d/bxkbtAug


Can someone help me please?

[CompoundCarl]

Why don't you just watch the communication log when this happens? If you see G1 commands getting sent that have E-values that are increasing, then it must be a problem with the printer, since the commands that are being sent are telling the printer to extrude plastic

[doublehelix]

Thank you for the advice!
I digged into the codes and found something strange. The picture shows the original generated gcode on the left and the sent gcode on the right.
The highlighted lines show the difference. As you can see the speed for the extruder is way to high in the sent gcode, thats why I think the stepper just stopps.
Do you have any clue why this is happening?

Pic:

[CompoundCarl]

I doubt it would change the F-values in your file, so most likely, I'd say you're just looking at the wrong part of your gcode file.

If you do a text search for that exact line with F2520, do you see it in the gcode file? Are you sure you actually sent that exact file?

[doublehelix]

Found out, that it was a bug in the firmware! Don't know where, I just downloaded the latest version of marlin and configured it again.
Works now like a charm

Thx all for your help!