How to fix Z-axis wobble?

[mespilus]

I'm not sure if my rods came slightly bent, or if the milling on the couplers isn't quite centered, but I am getting a wobble on the extruder head of about +/- 1mm from side to side when the Z-axis motors are moving the extruder head up or down. Has anyone else encountered this? How did you correct the problem?

[Sherry]

please tell me your printer type.thx

[mespilus]

Acrylic I3 Pro B

[Sherry]

I'm not sure if my rods came slightly bent, or if the milling on the couplers isn't quite centered, but I am getting a wobble on the extruder head of about +/- 1mm from side to side when the Z-axis motors are moving the extruder head up or down. Has anyone else encountered this? How did you correct the problem?

SORRY, which part do you said.could you take some picture and let me see.

[mespilus]

It's the 8mm x 300mm threaded rods (vertical rods). One side wobbles a lot more than the other side. I'm pretty certain that it's the rods that are bent, and not a problem with the couplers.

[mespilus]

The parts that are bent are the M8*L300mm Z-axis threaded rod (part #4 in the part list).

[Sherry]

hi,mespilus.please find a reference plane,and press the threaded rod with rubber on the reference plane.Remeber not use the solid object and not destroy the thread.if it doesn't work,you need to change a new threaded road.thx