Y axis layer shifting and noise
I recently built my Prusa i3 mk3 kit, and it was printing pretty well. However, it detected a y-axis collision when there was no collision, so I tightened the y-axis belt. After tightening, I checked the belt tension in the support menu. The x-axis is 262 and the y-axis is 274. However, there is now a kind of grinding noise when the y-axis moves quickly in either direction. When I move it by hand, I don't hear the noise, but it is present every time the bed moves quickly. Also, I have noticed some layer shifting starting after I adjusted the belts on specific prints. I included my print of the triceritops skull that comes on the sd card from before I tensioned the belt, which turned out amazingly. I also included the same model printed after I tensioned the belt, where some layer shifting can be seen at the base. Finally, I attached a print of the wistle that also came on the sd card, which was printed after I tensioned the belt and did not experience any layer shifting. I don't know what's going on, but I'm afraid to start larger prints if this is going to continue.
Re: Y axis layer shifting and noise
I recently built my Prusa i3 mk3 kit, and it was printing pretty well. However, it detected a y-axis collision when there was no collision, so I tightened the y-axis belt. After tightening, I checked the belt tension in the support menu. The x-axis is 262 and the y-axis is 274. However, there is now a kind of grinding noise when the y-axis moves quickly in either direction. When I move it by hand, I don't hear the noise, but it is present every time the bed moves quickly. Also, I have noticed some layer shifting starting after I adjusted the belts on specific prints. I included my print of the triceritops skull that comes on the sd card from before I tensioned the belt, which turned out amazingly. I also included the same model printed after I tensioned the belt, where some layer shifting can be seen at the base. Finally, I attached a print of the wistle that also came on the sd card, which was printed after I tensioned the belt and did not experience any layer shifting. I don't know what's going on, but I'm afraid to start larger prints if this is going to continue.
Assuming you're on the latest firmware, the set screws on the drive pulley could be loose, causing it to skip with enough acceleration. I've had that happen a couple of times.
Re: Y axis layer shifting and noise
I recently built my Prusa i3 mk3 kit, and it was printing pretty well. However, it detected a y-axis collision when there was no collision, so I tightened the y-axis belt. After tightening, I checked the belt tension in the support menu. The x-axis is 262 and the y-axis is 274. However, there is now a kind of grinding noise when the y-axis moves quickly in either direction. When I move it by hand, I don't hear the noise, but it is present every time the bed moves quickly. Also, I have noticed some layer shifting starting after I adjusted the belts on specific prints. I included my print of the triceritops skull that comes on the sd card from before I tensioned the belt, which turned out amazingly. I also included the same model printed after I tensioned the belt, where some layer shifting can be seen at the base. Finally, I attached a print of the wistle that also came on the sd card, which was printed after I tensioned the belt and did not experience any layer shifting. I don't know what's going on, but I'm afraid to start larger prints if this is going to continue.
Assuming you're on the latest firmware, the set screws on the drive pulley could be loose, causing it to skip with enough acceleration. I've had that happen a couple of times.
I ended up taking it mostly apart and reassembling paying close attention to steps 24, 25, and 30 in the y-axis assembly step ( http://manual.prusa3d.com/Guide/2.+Y-axis+assembly/507?lang=en ) and the drive screw as you mentioned. It seems like both problems are fixed! Thank you for your help.