RE: Filament always gets stuck in Nextruder on retraction—but only filament 5

Tom De Winter — Sat, 21 Feb 2026 02:29:28 +0000

I use a loading fork/guide in the buffer and have on occasion forgotten to remove it after loading. Could it be something this simple?

If not, I’d suspect a restriction between the MMU and the buffer on #5. Also check the set screw on the drive spur in the MMU #5.

Filament always gets stuck in Nextruder on retraction—but only filament 5

jlconlin — Fri, 20 Feb 2026 22:41:32 +0000

I've got an MMU3 with a MK4S. Filament 5 keeps getting stuck when being extracted from the Nextruder. I have no clue why this happens. I just cleaned the MMU3 itself so there is no debris in there.

I just finished the simple 5 color test ring and everything went smoothly. I then tried something harder like the 5 color benchy. Every time color 5 unloads, it gets stuck in the Nextruder—but only color 5. All the filaments are the same material, age, and brand. (Granted it's a cheap brand.)

Why would only color 5 get stuck?

Filament always gets stuck in Nextruder on retraction—but only filament 5 - Hardware, firmware and software help

RE: Filament always gets stuck in Nextruder on retraction—but only filament 5

Filament always gets stuck in Nextruder on retraction—but only filament 5