Ball bearing toy
thingiverse
Just a sort of ball maze I put together from a handful of basic elements. It's one continuous loop for a 12mm steel ball. Printing it with FDM could be a bit tricky I'd guess. Should be possible to print with SLS and then click the ball in. Added a version with a 12mm ball for SLS printing. This is an extended version of a thing I made before and printed with grey PLA on an FDM printer. Since I don't have a dual extruder printer, I ordered a white thing in ABS from Reputech (https://www.3dhubs.com/service/reputech). He did an excellent job with solvable support material.
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