8mm ball transfer unit (BTU) trackball tester
thingiverse
Holder for 3 Bosch-Rexroth Bosch R053010810 ball transfer units (omnidirectional bearings) to support a ~44mm trackball. The fit is a bit loose so they're not a press fit or anything, you can just turn it upside down and they'll just about fall out. It's a tight enough fit for them not to wobble. On its own this isn't much use, it's just a prototype for testing a mod for the Ploopy trackball. v1: BTUs fit straight into BTU tester v2: BTUs fit into a sleeve, which fits into the BTU tester. The sleeve should be printed in TPU. Note that the sleeve didn't make any difference to the sound, so it wasn't really successful.
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