[MMU2] Wrong purge at end of print

[acorderob]

Version

1.41.0+win64

Operating system type + version

Windows 10

Behavior

When printing a multimaterial object whose ending layers are only one material, at the end of the print there is a purge in the wipe tower, but the tower stopped growing in the last multimaterial layer, so it purges in mid air. I expect it to not do a purge at the end of the print since it doesn't seem necessary.

STL/Config (.ZIP) where problem occurs

issue.zip

[bubnikv]

That is the final ramming before the filament is pulled from the nozzle and parked into the filament switcher. This is a FAQ. Closing.

[3Dietrich]

same issue here but I don't use prusa MM but Palette2, no "ramming" and "parking" needed, it plans to spit out filament into air - threatening the print, is there an option to avoid that?

[lukasmatena]

@akust Ramming can be turned off in filament settings (Filament Settings -> Advanced->Ramming settings... and then shorten ramming to zero). It of course turns off the ramming for the whole wipe tower, which is desirable in your case, as far as I understand it.

The parking position of the filament and similar stuff is configurable in Printer Settings -> Single Extruder MM Settings (the group is only shown when Single Extruder MM is set on General tab.

Let us know if it's flexible enough for your needs.

[3Dietrich]

@lukasmatena
Great, thank you for the detailed informations and the FAQ!

[jaydenlawson]

That is the final ramming before the filament is pulled from the nozzle and parked into the filament switcher. This is a FAQ. Closing.

There is no FAQ called Closing.

[rtyr]

https://github.com/prusa3d/PrusaSlicer/wiki/Frequently-Asked-Questions-(FAQ)

[jaydenlawson]

https://github.com/prusa3d/PrusaSlicer/wiki/Frequently-Asked-Questions-(FAQ)

Thanks. I suspect the FAQ called "Why there is an extrusion hanging in the air over a multi material wipe tower?" used to be called "Closing", so this would be causing some confusion, as it did for me.

[dwprod38]

@akust Ramming can be turned off in filament settings (Filament Settings -> Advanced->Ramming settings... and then shorten ramming to zero). It of course turns off the ramming for the whole wipe tower, which is desirable in your case, as far as I understand it.

The parking position of the filament and similar stuff is configurable in Printer Settings -> Single Extruder MM Settings (the group is only shown when Single Extruder MM is set on General tab.

Let us know if it's flexible enough for your needs.

I've yet unchecked "Enable ramming for mutlitool setups" --> Nothing changed...

Remark: it was same issue with 2.1.1 and solved with 2.2.0 but bug is reappeared since 2.9.0...

I invite @Jan-Soustruznik to reopen this issue to be re-investigated...