filament retraction with reprap firmware

Hello, I've built another delta printer and decided to try RepRap firmware to run it, all went well and straight forward until I finished a print, at which point the filament retracted-but retracted all of the filament out of the bowden tube!!
The setup is RepRap V 3.2.2 running on a SKR V1.4 turbo board with TMC2208 drivers, the firmware is the wifi version although that is not connected yet (still waiting for the wifi module) . The firmware was compiled using the RepRap config tool
and the only "unusual" part of the machine is the heated bed is 115V running through a relay. I am very pleased with the firmware and setup apart from this one" problem" . The slicer I use is Cura and the problem is not present with Marlin or Smoothie.

Unfortunately Cura sends M82 to put the extruder in absolute mode before it runs your slicer end script. This causes a simple filament retraction command such as G1 E-5 in that script to behave as you observed. So start your slicer end script with either M83 to reinstate relative mode, or with G92 E0.

Edited 1 time(s). Last edit at 06/29/2021 01:45AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].