Unwanted move (wipe?) before retraction in external perimeter

[seancmonahan]

Description of the bug

PrusaSlicer emits a move (G1 with no extrusion) before the retraction at the end of external perimeters.

Expected would be no move before the retraction:

Project file & How to reproduce

PrusaSlicer - external perimeter unwanted wipes.zip

1. Disable Wipe while retracting
2. View G-code at the end of external perimeters.

The only non-default settings are disabling Wipe while retracting, and setting Minimum travel after retraction to 0 mm for clarity in the G-code visualization. Otherwise all default print, filament, and printer profiles for Ender-3 V2.

This occurs with both regular (G1 E-) and firmware (G10) retractions.

While reviewing the report before posting, I noticed that enabling Verbose G-code adds the comment ; move inwards before travel. Is this a configurable setting? Would it be possible to disable it, or at least reorder it so the retraction happens before the inward wiping motion?

For now, I'm just adding a regex to my Output options to comment out moves immediately before retractions.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

Version 2.7.2+linux-x64-GTK3

Operating system

AppImage x64-GTK3 on Linux 6.7.4 SMP PREEMPT_DYNAMIC Sat Feb 10 09:41:20 UTC 2024 x86_64 GNU/Linux

Printer model

Ender 3 V2 - Klipper, but happens with default profiles, too

edit: removed text that Github misinterpreted as a link to another issue number

[seancmonahan]

For now, I added the following G-code substitution regular expression in Print Settings -> Output options
Find:
^(G1(?: [XYZ][0-9.]+)*( F[0-9.]+)?(?: ?;.*)?$)\n(G1 E-|G10)
Replace with:
;\1 ; unwanted wipe\nG1\2 ; extracted speed from elided wipe\n\3
Description:
remove unwanted wipes before retraction (see https://github.com/prusa3d/PrusaSlicer/issues/12427)

[staal54a]

+1 also seeing this issue