I started getting failed prints, first with the PLA coming off the bed (glue stick fixed problem (so I thought)), then suddenly bubble affect on my print about 5mm high (abort print). I checked the Z axis stepper motor alignments according to step #23 of the Service bulletin (https://www.lulzbot.com/sites/default/files/TAZ-6_Square_Frame_service_bulletin.pdf), though my printer did not fall within the serial number range of the bulletin, the Taz 6 printer is about 2 weeks old s/n 25288. Sure enough there was a difference between Left and Right Z axis. Brought back in alignment, next print and all prints afterwards kept failing, out right badly from the nozzle dragging over the dried and bubbled up pla to just plain ugly entirely. Re-align and right back to failure. Checked the entire framing as described in the Service Bulletin. Everything is flush and squared as it should be. Same distance from corner to corner in all directions.
Lots of troubleshooting and searching and reading… long story short, what I found while checking the squaring of the frame is that the left threaded rod felt kind of binding as I would turn it to align it to a measurement. The right rod would turn smoothly and freely. I can’t see any type of adjustment for this. Seems as though the rod is slightly bent or something with the mount that rides the threads.
Attached is a picture as a result. You can see by the slant that the motors aren’t turning in synch, or in my case the left side is binding thus not moving up the appropriate amount, the same amount as the right side.
Also, homing the axis, adjusting to both sides are even, then running it all the way up the Z axis (270mm) works without a problem. That test passes. When I print, it fails. I tried both high detail and standard.
Please let me know if there’s an adjustment I can do or if you need to ship me out another part or if I need to ship this back for warranty repair. I have it apart right now for the squaring of the frame, no sense on putting it back until I can get that rod to spin and move freely.
This first picture is an example of how bad it got, and this is at standard height.
The second picture demonstrates how the vertical axis is crawling to the left.