printer unloads/reloads (sometimes random filiment) and fails print
Started seeing a weird problem with my i3 mk3s+ & mmu2s recently. While printing a multicolor print to goes fine for about 80% of the way changing filaments as needed. It then "errors"* on a filament load, unloads the filament, raises up moves to the right front of the platen and reloads the filament (or a random one sometimes) dribbles some filament in the corner, then restarts printing where it left off. It never changes filament again. It goes through the motions when on the wipe tower, stopping for a bit, but never changes filament. Aborting or starting a new print it seems to be "stuck" and never changes filaments again even though the new print may call for something different.
Powercycling the printer restores function until the next time it happens. Seems to happen every multicolor print now.
I say "error" in quote because it doesn't really flag an error, only that it is unloading and reloading the filament off to the front right of the platen (off print).
running current revs of firmware printer 3.10.0-4481 and mmu2s 1.0.6-372
I thought it might be because it was running through Octoprint, but same error occurs when printing from SD card.
Anyone have an idea on what might be causing this. I'm suspecting a mmu2s firmware/board problem but don't have much way to troubleshoot.
fj..
RE: printer unloads/reloads (sometimes random filiment) and fails print
I think I've figured out what's going on. I had spool-join enabled, and when a filament failed to load, rather than trying again, it rolled to the next filament and would not go back to previous(correct) once it failed. I guess that's the way it's supposed to work but not what I expected, nor wanted it to do.
So running a bunch of tests to see if I can figure out why it's not loading cleanly.
fj..
Check your i3 filament sensor and its connections - always the first place to go with spurious extra loads.
Cheerio,