I've been doing some research (i.e. watched part of a video for 3 minutes) and it seems like you can access the side filament sensor without removing the panel at all?
Mine doesn't work and it seems that the most common issue is that the pivot for the lever inside is too tight so it doesn't move properly.
So long story short, it's not the pivot screw. The magnet in the lever is definitely sticking out too far, the lever is missing a washer, but the biggest problem?
The mechanism is supposed to contain a ball bearing for magnet reasons. There is no ball bearing.
(The ball bearing is not for magnet reasons, it's there for the filament to push against so you don't wear through the lever.)
So that wasn't *that* bad. But I'm still not pleased that I spent a lot of money to have this thing assembled and still had to deal with significant issues.
Now the only thing wrong is the z-axis binding, which seems to be somewhat expected, unfortunately.
Just having a great day.
I loosened the z-axis trapezoidal nuts, and that did completely make the noise go away. Except now the printer won't level properly at all.
Naturally I assumed this was because the bed was too loose and there was too much play, so I tightened the screws in the nuts back up. That didn't fix anything, but did make the z-axis much louder.
Long story short, the thumbscrews that hold the nozzle in were way too loose.
Lubricated the z-axis screws and that completely made the noise go away. Didn't want to look for the Prusa lubricant, so I just used the Mobil stuff. Smells the same as the grease on the rods, so it's probably fine.
Every Lithium soap all purpose grease will be fine for the spindle.
Also known as ball bearing grease. Nothing special needed.
For linear rail bearing this could bee to stiff fir fast moving speeds, but z Axis is slow all the time
Dennis
Doppelmembran-Würgenippel