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MK4S MMU3 finish print with another filament?  

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2AHumanRight
(@2ahumanright)
Eminent Member
MK4S MMU3 finish print with another filament?

Is there a way to finish a print with another loaded filament? Say I was using filament 4, it ran out and I want to finish with filament 2, is there a way I can easily accomplish that? Easier than just loading another roll of filament that is. 

Napsal : 18/07/2025 11:12 pm
JP Guitars
(@jp-guitars)
Reputable Member
RE: MK4S MMU3 finish print with another filament?

The feature you describe is known as SpoolJoin. You would set the printer to use 4 with 2 joined on, when 4 runs out it automatically switches to 2. Instructions are here: https://forum.prusa3d.com/forum/original-prusa-i3-mmu3-general-discussion-announcements-and-releases/spooljoin-for-mk4/?language=fr

It sounds more complicated than it is

Napsal : 18/07/2025 11:23 pm
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2AHumanRight
(@2ahumanright)
Eminent Member
Topic starter answered:
RE: MK4S MMU3 finish print with another filament?

Oh ok, I have been using Prusa Link and that's probably why I haven't seen that option. It would be cool to be able to define that in the settings before its been sliced. 

Napsal : 18/07/2025 11:29 pm
JP Guitars
(@jp-guitars)
Reputable Member
RE: MK4S MMU3 finish print with another filament?

I think the problem is most single color prints don't need it so you would be complicating the UI for an edge case.

But you could add it as a feature request in github: https://github.com/prusa3d/PrusaSlicer I don't think it would get traction but what do I know?

Napsal : 18/07/2025 11:44 pm
2AHumanRight
(@2ahumanright)
Eminent Member
Topic starter answered:
RE: MK4S MMU3 finish print with another filament?

For those of us with the MMU3 I believe it would be used often if it was known about and easy to use. It would also become a selling point for the MMU3. I would be able to finish off a bunch of mostly used spools in one print. 

Napsal : 18/07/2025 11:56 pm
JP Guitars
(@jp-guitars)
Reputable Member
RE: MK4S MMU3 finish print with another filament?

I don't necessarily agree however I do think SpoolJoin needs to be far better publicised even in it's current state, as evidenced by your question and many others similar.

But as I said, put in a feature request on github, you never know, it might get taken up

Napsal : 19/07/2025 12:10 am
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