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MMU3: From MK3S+ to MK4  

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bonzer
(@bonzer)
Member
MMU3: From MK3S+ to MK4

I have an MMU3 that has come from an MK3S+printer. Apart from the correct cable, what other parts are required to install it on a a standard MK4? 

Thanks 🙂

Napsal : 26/12/2025 4:26 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3: From MK3S+ to MK4

nextruder
modified main plate and 'o'ring
modified filament sensor and idler nut Longer screws, binocular spacer
Modified Idler Swivel sides,  Longer screws for swivel nut
Modifies Idler sides
2x PC4 x5mm PTFE Fitting, wjth larger bore one for nextruder, one for mmu3 selector
Standard nozzle not HF Nozzle

I think that's about that!

Joan

 

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK

Napsal : 26/12/2025 9:21 pm
bonzer
(@bonzer)
Member
Topic starter answered:
RE: MMU3: From MK3S+ to MK4

Thanks Joan, I appreciate the comprehensive answer. 

It seems that prusa no longer provide these parts as a kit. Is it possible to buy the parts elsewhere? I can't seem to find anywhere for the larger ptfe fittings (I believe these have to be 2.6mm). 

Napsal : 26/12/2025 10:00 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3: From MK3S+ to MK4

A 2.6mm drill makes short work, of that task! 

Just make sure that you clear the chippings out of the fastener before you use it

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility.Location Halifax UK

Napsal : 27/12/2025 2:28 pm
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