Prusa3D Forum - Recent Topics

Filament Change with MMU3 takes five minutes

barney15e — Fri, 17 Apr 2026 12:09:50 +0000

Normal wipe tower operation up until the point where it should retract the filament. At that point it just cycles back and forth like it is wiping, but no filament is extruded. After about five minutes of this, it retracts the filament and makes the change. Next filament change results in the same cycle.

All kind of funny when I got an email telling me how fast the new firmware would change filaments.

Filament: PCTG - 3D Fuel

When I get a chance, I'll try the same model with PLA to see if that is connected.

Extruder crashing on wipe tower after firmware update

Steve — Thu, 16 Apr 2026 20:32:52 +0000

Extruder crashing into wipe tower after update

This is happening on my CoreOne+. I've got the Coreboxx on top with active smart rewinders by @mire.

I've tried adjusting settings on the wipe tower, and it makes no difference. Eventually the extruder crashes and ruins the print. I've tried this print three times now.

Extruder crashing into wipe tower after update

Steve — Thu, 16 Apr 2026 19:54:43 +0000

I've just updated to the "new" firmware, and on my first print I had the layers shift. This happened three times. The culprit is the wipe tower. For some reason, large blobs of filament are deposited into the wipe tower on filament change. Eventually, the buildup will cause the extruder to drag and the motors will skip steps. This is happening on my CoreOne+. I've got the Coreboxx on top with active smart rewinders by @mire. Attached is a pic of one of the wipe towers. I've tried adjusting settings on the wipe tower, and it makes no difference. Eventually the extruder crashes and ruins the print. I've tried this print three times now.

b06340a7-img_5167.jpg

Extruder crashing on wipe tower

Steve — Thu, 16 Apr 2026 19:48:20 +0000

17f3a80d-img_5167.jpg

Extruder crashing on wipe tower

Steve — Thu, 16 Apr 2026 19:46:22 +0000

1373646c-img_5167.jpg