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kmccon

PRUSA MMU2 Selector Improvements

by kmccon Oct 15, 2018
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kmccon, You have done an excellent job in your improvements. I remixed your work with a very exaggerated inlet since the MMU2 is not very forgiving when it comes to curving filament. There have been a few makes from my remix and its seems your work has help out quite a few. Just want to make sure you get the kudos and credit as its well due. Looking forward to more of your innovation in the future.

Thanks I appreciate it.

Great part, must have for MMU

It would jam going into this part, the chamfer helps a great deal, slides in better. Plus the pegs holding the blade are much better, my blade fell out a few times. Ty for this :)

I am so frustrated with the MMU. It will just not work. Going to try your solution. Do you think PLA will be OK. I actually also do not understand how the cutting can be one way only. Have you thought of splitting the blade into 2 so it forms V and can ct in both directions ?

I don't see an issue using PLA. I recall looking at that and there was something in the design that made me think it wouldn't work well. I will look at it again.

Does one print all three parts or just the selector and blade holder? I'm not 100% clear on where the other part goes...

Probably need all 3. See the attached picture for the third piece.

Ahh, I'd totally forgotten about that piece.

The filament doesn’t go through the selector and the blade does pop out even though it is completely tightened so I might print this one later. Did you have the same issue with the filament not going through?

Yes, the big issue was feeding filament. My blade was working ok, but it was difficult to get it installed right. I saw several others with similar complaints which is why I redesigned the blade locator. With the 3 pins, it doesn't need the tension as much.

Prusa doesn't have good lead-ins for most of the filament paths. The one into the selector is probably the worst.

Thank you very much. It seems like Prusa didn't think through design details. Does it perform better now? Do I print in PETG? Thanks!

I think it helped. If you think about how may times the MMU2 has to "thread the needle", anything you can do to fix transitions will help.

I have a spool of the Prusa nGen. But I think PETG will work well.