This a parametric bearing. I wrote it as a little challenge to myself, to see if it could be done in a tweet :) The OpenSCAD source file here is the full expanded source, because the tweet version is a little harder to read ;) They both do exactly the same thing, however.
Find it on Twitter here: https://twitter.com/kevfquinn/status/998301858010685441
There are a couple of example STLs - the numbers in their filenames are the values of the various parameters used to create them. Note the last number is the resolution of the STL - this can be read as a layer height; printing at a lower layer height will not yield a more accurate model.
1. Bearing radius to ball center
2. Bearing wall minimum thickness
3. Bevel radius
4. Bearing height (channel radius)
5. Clearance between bearing and balls
6. Resolution of inner channel and bearing balls (~layer height)
Key parameters are the bearing radius and the height. The radius is from the centre of the bearing to the centre of the balls. The height determines also the size of the balls; the ball diameter is the height less the clearance amount.
Clearance may well need adjusting in line with the accuracy of your printer. For me, 0.2mm either side of the ball (so 0.4 setting for the clearance parameter) is enough that the balls are almost free - having them not quite fully free after printing helps with removal of the support material under the balls, then they're easily freed with a little encouragement.
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