recirculating ball slider

This is inspired by a design that I can't locate on thingiverse now. (it was a single-sided version of this)

This fits 2020 style rails and is fully parameterized on onshape

double slide
https://cad.onshape.com/documents/26ee0e5b03c66a9be90c58d1/w/cc28cee1a6669f90de84a381/e/92afbf062997c6e0ad010ccb

single-slide
https://cad.onshape.com/documents/26ee0e5b03c66a9be90c58d1/w/8612de08e39c79f2214059b9/e/92afbf062997c6e0ad010ccb

Adjustable preload double slide

https://cad.onshape.com/documents/26ee0e5b03c66a9be90c58d1/w/d1099d18ac6dfbbd3e15d280/e/92afbf062997c6e0ad010ccb

you can adjust the rail size, number of balls, preload, and slop the ball size

I printed this on an Ender 3 with PrusaSlicer with 20% infill This includes support for the retainer.

I tested this with 5/16" and 3/8" balls (available as slingshot ammo on Amazon for ~$20 to get 1000-1500)