@neotko I guess that there could also be wrong with the z-nut but in the video, the z-screw has been removed. So it seems that I definitely have an issue with the linear bearings on the z-axis.
How does one swap the bearings out?
@neotko I guess that there could also be wrong with the z-nut but in the video, the z-screw has been removed. So it seems that I definitely have an issue with the linear bearings on the z-axis.
How does one swap the bearings out?
@neotko I guess that there could also be wrong with the z-nut but in the video, the z-screw has been removed. So it seems that I definitely have an issue with the linear bearings on the z-axis.
How does one swap the bearings out?
On umo+ is easy since it has scape holes up and down, but um2 only has bottom for the shafts to leave. I suppose with strength and much care. Check the um2 assembly manual and follow in reverse ?
https://github.com/Ultimaker/Ultimaker2/blob/master/um2%20assembly%20manual%20V1.1%20_english.pdf
Edited by GuestFrom your photos it looks like you have constant z-axis banding that you are trying to solve. If so, replacing the sticking Z bearings may not solve the problem.
The symptom of bad Z bearings is a bad layer at approximately 10-12mm height on the printed object, which shows up consistently. This is a result of the bearings sticking after direction reversal and that happens at about 10-12mm after the direction reversal, which you can see happening at the beginning of your video.
Continuous horizontal banding is a different issue that has been discussed at length on this forum. Regardless of this however, changing your Z bearings to better quality ones that don't stick is a good move.
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neotko 1,417
If you are in warranty check with your reseller. It might be the z nut (a new one costs 3€ from pololu) or the flanged bearings (misumi new ones cost 10-20€ each depending on the quality)
Google neotko pololu misumi ultimaker
And check more posts with that issues and solutions.
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