Pre-assembled MMU3 Poor wire connection
I bought a pre-assembled MMU3 and got it installed a week ago. I've done a few multi-colored prints, and many single-color prints. Up until today, it has been going mostly fine. I just finished a single-color print and was getting another one ready to go. A few minutes after I sent the job to the printer, I notice that the connect app says an error occurred with the MMU3.
I go the printer and see an "Unknown Error" message. I reboot the printer and notice there are no lights or initial calibration movement from the MMU3. I reboot again and nothing again. I open up the back, and all of the cables seem seated properly. I turn the printer back on and start wiggling connections again Then I notice after firmly pressing in one of the connections on the back of the MMU3, I get signs of life again! I've highlighted in the attached picture which one it is.
I've reconnected this cable, and it clicks into place securely. I'm not sure why the connection is all of a sudden so sensitive. I have noticed that when gears are spinning on the MMU3, the enclosure bounces around quite a bit and I'm not sure if that is normal. Has anyone come across this issue or know a fix for this?
RE: Pre-assembled MMU3 Poor wire connection
Messing with it more, I don't think it is the wire connections in the back. If I just nudge/wiggle the whole back of the MMU3 that these cables are plugged into, I can get the MMU3 to turn on again. If it manages to stay on long enough when I restart the printer, it will try to do the initial movement stuff, but once the gears on the MMU3 start turning and causing the enclosure to wobble around, it shuts off again.
RE: Pre-assembled MMU3 Poor wire connection
Well I think I figured out what happened, so I'll just post here for anyone else with a similar issue.
I took the top off of the MMU3. I checked the board to make sure things were looking fine. I noticed that the part that the main cable plugs into (circled in picture below) wasn't seated into the board all of the way. I did notice that was loose, but I sort of figured it was designed looseness (since the whole things bounces around when the gears spin to change filament too). But once I took the cover off, it was obvious that I needed to squeeze that part back into place. I didn't hear any click though. Now I wonder if it will get loose again since the enclosure does so much bouncing around with normal use...
Either way, I've been able to boot it up and get another print going without the MMU3 turning off.