Motor clicking, skipping steps + filament dirt in pulleys constantly
Hi all,
I have been able to get my MM prusa working from time to time, got it on the 2nd week after delivery started. (so have it for quite some time already)
However, I have never been using multi material printing a lot, so most of the times I was still printing single color/material. And besided a small reduced print quality never had a lot of issues then.
The problem I'm having since quite some time now however is that the motor is constantly clicking and that the pulleys are grinding a lot of filament and getting dirty all the time.
Because of this I have under extrusions to no extrusion at all after some time. This is when doing single or multi color/material prints. The issue doens't seem to be filament affected, since I have tried ABS, PLA, many different colors and branches. But it happens with all of them.
Sometimes when I switch from motor 1 to 2 or a different one it works for one print. But then the issue reoccurs again. (so doesn't seem to be an extruder problem?)
I have checked the spring distances and tried loosening them a bit more.
I have tried changing print temps which did sometimes solve the issue, but was only of short time. (as suggested in another thread)
I have replaced the PTFE tubing with one bought from prusa as a spare for MMU, but didn't solve the issue.
I have cleaned all pulleys before, did solve the issue for 1 print. But then they got dirty all again. I don't think it's needed to remove all pulleys after each print to properly clean them? I also have bought some metal brushes, to clean the pulleys when they are inserted, but this doesn't really help at all.
I have used cleaning filament and tried cold pulls, but also didn't solve this issue.
Did anyone else here had this issue and found a solution to solve this?
Or does anyone else have a possible theory of what is causing this issue?
Thanks a lot,
Tom