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hey Tom, I'm having similar problems and I think it may be due to a combination of imperfections in the way the printer makes the hole, plus not getting the bearings to drive in square. I have an idea to try and can let you know how it works out. I plan to first ream the hole that the bearing sits in slightly with a drill bit. Then I will place the 2 bearings onto a rod, slide a block (similar to the jig but with a hole clear through) over the rod and drive the bearings down while being braced/aligned