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Color Bleed MK4S MMU3  

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sinisan14
(@sinisan14)
Active Member
Color Bleed MK4S MMU3

Hello, I am having color bleed issues that are especially visible in lighter colors. 

Would ticking the "Infill before perimeters" option help? It makes sense to me that the next color purges a bit of the old color in the infill and by the time it prints the walls the bleed is gone. I haven't tried this yet but does that make sense?

Respondido : 02/04/2025 1:18 pm
LarGriff
(@largriff)
Reputable Member
RE:

Purge Volume needs to be increased.  Also, be aware that if you have a High Flow nozzle you will need to increase the purge volume a LOT.  Check that the High Flow setting (in PrusaSlicer) matches what is installed.

MK4S/MMU3

Respondido : 03/04/2025 2:26 pm
sinisan14
(@sinisan14)
Active Member
Topic starter answered:
RE: Color Bleed MK4S MMU3

My current purging volume is set to 240mm3 with the color bleed. The default is at 140, how much should it be for a HF0.4 nozzle?

Respondido : 03/04/2025 2:46 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Color Bleed MK4S MMU3

the MMU3 works better with a standard flow nozzle, can you change the nozzle to a standard nozzle? 

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

Respondido : 03/04/2025 5:45 pm
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LarGriff
(@largriff)
Reputable Member
RE: Color Bleed MK4S MMU3

Yeah, if you have a high flow nozzle you may need more like 300-400 if you’re going from red to white.  Especially if you’re  using PETG.  No wonder the standard nozzle is recommended.  Here’s a tool that has helped me determine purge volumes.
https://www.printables.com/model/1147770-easy-mmu3-purge-calibration-tool-for-mk4-and-other

MK4S/MMU3

Respondido : 03/04/2025 5:59 pm
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