RE: How can I get rid of these vertical lines?
Search for threads on VFA ... many solutions offered, though none with the existing hardware. Most require a motor change or three. Others require a full extruder replacement.
RE: How can I get rid of these vertical lines?
What kind of filament are you using? It could be a layer height issue because I had that happen on my Darth Vader bust and I resliced it with different temperatures and layer height and haven't had a problem since. It doesn't involve a extruder replacement or a change of motor. If it doesn't work, you can try a cold pull and that should help it a lot. Let me know how it goes. Would you mind telling me the name of that file so I can replicate it too? It could also be a file issue.
I'm a high school student who has had the MK3S MMU2S for a year and have had a lot of successful prints. I try to help as much as I can.