Been working on my Z axis, and finally concluded that the wheel brackets were the issue. My machine has been outside in the hot sun, cold, etc, etc for a long time. Many of the original printed parts are getting rather wonky.
In this case, I could barely pry the bearing out of the slot, much less get it back in.
I haven’t touched my printer in a while, didn’t want to take the overhead on that.
So here’s what I did:
Cut a wooden shim just maybe 0.5-1 mm wider than the slot that holds the bearing.
Jam it into the slot.
Bake at 145F for 20 minutes.
Toss in the fridge for 10 minutes.
Holy Crap, it worked! The whole part is nice and straight again, just like new!
I didn’t take a before pic, but believe me the whole thing was badly out of shape before. It was gripping the Z rails and preventing movement.
Putting it back together with some washers for good measure.