Lego EV3 Caster ball with 16 mm marble ball
thingiverse
This ball caster was designed with a 16 mm ball in mind, but I used a glass marble instead. Steel balls would work better, but they're hard to find in that size. The dimensions of the caster are as follows: inner diameter is 16.8 mm and outer diameter is 22.5 mm. To get the best results, I recommend printing this thing at a layer thickness of 0.1 mm. The file is laid out upside down. I made some minor edits to the design on April 4th, raising the sphere by 0.5 mm. You can find the step and Kompas-3D V17 files in the attached archive. I got all the dimensions from a post on Bricks Stack Exchange.
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