Printed parts as V groove bearings on linear slide

I've been trying print v groove bearings to guild along a 12mm shaft. See attached. The bearing is a 608 skate bearing. I just mocked up a steel plate to mount the four bearings on for testing purposes.

The issue is that I can't get the outer surface of the V to run exactly true with the bearing. The as printed part tends to grab as it rolls. I eventually turned the outer V's on a wood lathe but its still not smooth enough. I even strengthened the layers with CA. The material is PLA

Any ideas?

Your V-grooves are simply not round enough. To improve the situation you could

- make the diameter bigger, so the friction on the outer part is higher in relation to the friction in the bearing or

- put something with high friction coefficient (rubber) into the V-groove.

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