@ThantiK One bar wobbles more.
Do I just build a rotary station, spin like heck
And push with broom until wobble free or I decide I like horizontal stripes?
Horizontal stripes bad. Anchoring these in a specific way in your printer should allow them to float without transferring the defect into your parts. How were they mounted prior?
Horz stripes must mean pitch angle on the 8mm threaded rod.
There are 2 motor couplers 3DMakerWorld Shaft Coupler 5mm X 8mm (Set Screws) Aluminum cylinder cut into spring in the middle.
Amazon: $5
The Z-Axis part “Looks” like Prusa i3 Z-axis TR8 8mm leadscrew / trapezoid thread mod by BJoe - Thingiverse . There is a 8mm (i guess) nut. It is very loose on the rods.
The lead screws I see don’t look like they have as much resolution as a perfect 8mm rod…
Also, I’ve taken off the motor couplers and replaced, but notice the LEFT motor shaft is very slightly bent. (Wow) The right shaft spinning with only motor coupler looks like it is standing still at high speed… (no wobble).
I’m swapping the motor to another spot (extruder?) and buying a new one.
+ThantiK I ended up flipping 1 rod, replacing a motor coupler and it is great again (with reduced height quality I guess.) Thanks.
Vertical height is now back to 100 mils.
The motor coupler may have been more of a problem than the actual rod. You want to allow the rod to ‘float’ in the X/Y axis, but not the A axis or the Z axis.