PVA filament breaks inside the MMU
I recently got a newly upgraded i3 MK3S + MMU2S working and have done a few single-material PLA prints with each of the material slots and everything seems to be working quite well. Unfortunately, I'm having an issue when I try to print soluable supports. I bought a spool of PVA to use for the supports but almost every time the MMU unloads the PVA to switch it out, the filament breaks off in the MMU (leaving some filament inside the feed tube) so it can't finish unloading it and the print fails. I tried several times and never got past the third layer due to this issue.
Does anyone have some advice for working with PVA with the MMU2S?
RE: PVA filament breaks inside the MMU
Some people said that it is working well by using the BVOH profile. Myself I could not make it work, I gave up.
RE: PVA filament breaks inside the MMU
@corkr900
I would seriously recommend getting your MMU2S dialed in with 5 colour multicolour prints using PLA from the same manufacturer and there take filament with good dimensional reliability. If you get your printer to work just fine without any problems with that you can dial up the difficulty and try nasty stuff like soluble support material.
Printing single material from the different filament ports tells you very little about how well the MMU2s works.
It is said that BVOH substantially easier to handle and that one should evade PVA. I don't have experience with that but I do own some BVOH. The reason I haven't tested it yet is that I am just getting the hang of step one which I mentioned above.
If you do use PVA or BVOH, it is crucial that the filament is really dry, that means you might need to dry it before use.
Mk3s MMU2s, Voron 0.1, Voron 2.4