I have a Velleman K8400 printer.
Version 4.1.0 and 4.1.1 do not provide extrusion. Version 4.0.1 works perfectly.
I have compared the 2 gcode files and see that the latest version often contains the code G1 E-4.0000 F2100. Then the filament always retreats instead of moving forward.
Version 4.01 works perfectly but the new version does not work at all. Does anyone know the solution? I have added the 2 files.