Extruder motor won't run

K8200 3D Printer K8200 - Printer software (repetier, slicer, ...) a
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Good news! Sounds like you are getting close.

You can change the direction of the extruder motor by editing a file in your Marlin firmware project and reprogramming the Arduino. In the Marlin project, edit the Configuration.h file and look for the following line:

#define INVERT_E0_DIR false

…and change it to…

#define INVERT_E0_DIR true

If the line already says “true” then change it to “false”. You can reverse the direction of any of the motors by editing the lines near this one. Save the file, recompile the firmware and load it onto the controller.

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Dr Vegetable How do I get at the code to change it? Tried in Arduino including opening C++ source code. Couldn’t find any such lines

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Those lines should be in the file named Configuration.h. If you have downloaded the Velleman firmware you should be able to find this file in the Marlin folder.

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Dr V thank you - now runs right way!

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No trouble. Happy printing!