Massage Roller Ball Z
thingiverse
I remixed this primarily because I wanted deeper massage. The roller ball is larger in diameter and protrudes farther from the base. The base is elongated for better ergonomics. I also switched to 6900Z bearings for the larger diameter center to allow me to use thicker pins for more strength. Print one base, one roller, and two pins. I used superglue to hold the pins in place and it hasn't failed yet.
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