linear bearing backlash, big X axis issues

[GilbertAZ]

@zhd

Alright thanks , taking it apart I noticed replacing the steel rods is not a big deal so I guess I’ll go down that route as well in the end.

Right now, my sloppyness in the head is gone by just replacing with new IGUS bushings (i had them around anyway)

There is still a slight slop but I guess that comes from factory.

Honestly I would suggest Lulzbot to adress this in future TAZ’s because that is something that wears out far too quick on an otherwise perfectly solid machine. It’s not like I put 400 hours+ of printing in



On a unrelated note - since replacing the bushings I now have a disgusting loud grinding noise when Homing Z axis?? I only changed the bushings on the X axis , no idea how I managed to create that. It sounds like the Z axis threaded rods are producing this sound when retracing the head all the way down near the print bed… sounds like it’s coming out of the stepper motors for the Z axis

Any ideas? when I raise Z higher the noise goes away and the head runs up smoothly no problems

I’ve got the same issue. The bearings were so sloppy I could easily twist the x carriage. I think is it just a poor choice of components. As for the noise, see this post TAZ 4 left & right Z motors get out of sync - it is NOT unrelated. Seems like a common issue. I think someone must know the secret to setting up the x rods, because as soon as I took mine out, I could not get them back together without the zaxis grinding and seizing. A whole lot of playing has got it to run mostly without noise and stopping.

I have replaced the IGUS with different bearings. We’ll see how they perform long term. I’ve only had the printer a few weeks, and not a lot of hours on it - maybe 30 - and those IGUS bearings were loose. They were probably that way the whole time - I probably just noticed after 30 hours of running. All the other axis are also loose as well. Its a systemic problem.