Bed leveling fails every time - right Z motor / assembly does not move (video)
I3mk2 self-assembled kit. XYZ calibration fine. Never arrived at printing anything.
Every time I get to the bed leveling, I get the "Bed leveling failed. Sensor didn't trigger. Debris on nozzle? Waiting for reset." Since I've printed 0 mm debris is not likely - and nothing is to be seen.
But while the left does, the right Z motor / assembly does not move during the bed leveling. Please have a look at this video: https://www.dropbox.com/s/j6xk0nc15qm25fk/Prusa%20i3mk2%20-%20Bed%20leveling%20fails.mp4?dl=0 (Dropbox, 18 seconds). Looking at videos of bed leveling on Youtube, this seems to be (as it sounds) an error.
Right Z motor / assembly gets stuck also at other times, but not consistently as when bed leveling. Left is never a problem. Have checked cabling and interchanged Z motor connectors on Rambo - still only problems with right Z.
After about ten days of failing to get a single print I'm getting sad. Any help much appreciated! Thanks!
Re: Bed leveling fails every time - right Z motor / assembly does not move (video)
Check protection cup on the right Z-motor. It looks like it (or something else) breaks motor shaft rotation.
Re: Bed leveling fails every time - right Z motor / assembly does not move (video)
Thanks for your fast reply, petr.u3!
Something did indeed hamper rotation, though not the protection cup: The bolt coming through the carriage mount scratched the back of the rod, especially when the carriage was low. I might have used a wrong bolt here. This is what it looks like:
I took the bolt back some, and now everything works: Bed leveling, printing.
Thanks again!
Re: Bed leveling fails every time - right Z motor / assembly does not move (video)
You mounted the screw wrong way. See http://manual.prusa3d.com/Guide/3.+X-axis+assembly/105 step 7.
Re: Bed leveling fails every time - right Z motor / assembly does not move (video)
Good catch, david.t2! Indeed I did. Thanks!