R2ZZ bearing cutouts for the Toyota 22RE transmission model gears

thingiverse

This is a remix of the gears and objects which use bearings in the excellent Toyota 22RE transmission model by ericthepoolboy. The original design calls for 3 mm rods and 623ZZ bearings. However, the rods I obtained have tolerances on the larger side (actual diameter is about 3.01 mm, which is enough of a variation such that it does not fit in the 623ZZ bearings). I believe this is a common tolerance for the rods. However, I found that my 3 mm rods will easily fit in a R2ZZ bearing (1/8" ID x 3/8" OD x 5/32" thk). It's a slightly loose fit, but for the purposes of the transmission model they work great. The 3/8" OD (9.5 mm) requires that the bearing cutouts be slightly smaller, so I rendered new stl files from the original, but with the smaller cutouts. For the objects with bearings on both sides, I also filled in the central connecting holes with about 0.6mm thk material - the 3D printer can then print it as a complete bridge, rather than a partial-overhanging through-hole. You'll just need to bore through the center with a 4mm bit after the print is done. Thanks to ericthepoolboy for this great model. The original model can be found at: https://www.thingiverse.com/thing:713815