Acceptable Level of Wobble (runout?) in Z-Axis Screw

[coolal 4]

Hey guys,

I can confidently say that after a week of printing on the UMO+, i'm officially addicted to 3d printing in general. I've started to dial in print settings and i'm getting better and better quality print after print.

There is one thing that keeps catching my attention: the z-axis screw. I bring the bed to it's lowest position anytime I want to remove a print. Consequently, i'm usually watching the bed quickly ascend for the "auto home" function. There's a really slight wobble (probably around .5-1mm of total runout) at the very tip of the z-screw. I can only spot it when it's spinning quickly to bring the bed up.

Is this something I should worry about? Or just the nature of the machining tolerances? So far I haven't noticed any wobble on print corners. So, I'm assuming that it's somewhat kept in check by the brass nut and two linear bearings.

I'd love to hear what is within tolerances.

Thanks again,

Alex

[Labern 735]

Ideally you don't want any wobble but the 2 linear bearings not the screw is what keeps it stable. If they have lots of wobble then you have a problem.

You maybe able to loosen the motor and tighten it again to try and line it up central.

A lot of people don't like how the bed sticks out and some put stiffeners to stop any wobble but that's on the plate not the lead screw.