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Upgrading mk4 to mk4s and getting mmu3  

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DylabE
(@dylabe)
Member
Upgrading mk4 to mk4s and getting mmu3

A while ago i got a mk4 from work  and am finally planning to upgrade it to mk4s and I'm gonna get the mmu3. I'm wondering if i should look at getting anything else like parts that wear or anything so i don't have to pay for shipping to the USA twice. 

Posted : 02/01/2026 1:48 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Upgrading mk4 to mk4s and getting mmu3

For MMU3, use a standard nozzle, not a high flow nozzle
the High flow nozzle, has a more complex filament path, that requires a larger purge volume during filament changes, and I Believe it also complicates 'ramming' which is required to get a good filament tip shape, during filament changes
regrads 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 : 02/01/2026 10:36 am
vhubbard
(@vhubbard)
Reputable Member
RE: Upgrading mk4 to mk4s and getting mmu3

Thermal sensor, heater, socks, are the normal replacement parts, but they are available from US suppliers also. It is time waiting for a part that matters. In 3+ years I have only had a nozzle temp thermister fail. I have diamond nozzles and don't tend to change it much so wear and tear on heater and thermister wiring is low. All others were human error related. This is across 4 machines.

Posted : 02/01/2026 7:55 pm
Brown Kevin
(@brown-kevin)
Member
RE: Upgrading mk4 to mk4s and getting mmu3

 

Posted by: @vhubbard

Thermal sensor, heater, socks, are the normal replacement parts, but they are available from US suppliers also. It is time waiting for a part that matters. In 3+ years I have only had a nozzle temp thermister fail. I have diamond nozzles and don't tend to change it much so wear and tear on heater and thermister wiring is low. All others were human error related. This is across 4 machines.

This is really very good and best idea so keep it up thanks!

Posted : 02/01/2026 11:49 pm
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