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MMU3 to MK4 conversion  

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emtramone
(@emtramone)
Member
MMU3 to MK4 conversion

I recently obtained a new in box Mk4 not 4/s and I have an MMU3 that is installed on my Mk3s+. According to prusa chat, they do not offer an upgrade kit to swap the MMU from my Mk3s+ to the Mk4.  I was told I have to buy a whole new MMU unit. Is this correct?

Posted : 18/09/2025 1:10 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 to MK4 conversion

There used to be an upgrade, because I upgraded my MMU3 to work with the Mk3.9 printer, which uses the same processor and extruder as the Mk4

it's possible that they have discontinued the upgrade. 

You should be able to order the spare parts to do the upgrade. 
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

Posted : 18/09/2025 1:33 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 to MK4 conversion

Try
https://help.prusa3d.com/article/list-of-parts-for-mmu2s-to-mmu3-upgrades_887521

 

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

Posted : 18/09/2025 1:37 pm
emtramone
(@emtramone)
Member
Topic starter answered:
RE: MMU3 to MK4 conversion

That list helped. I will see if I can make that work. 

Posted : 18/09/2025 2:34 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: MMU3 to MK4 conversion

Good Luck, 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

Posted : 18/09/2025 3:29 pm
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