Split-Ring Joined-Cycloids 49:1 drive

1500:1 reduction ratio with only 4 main parts ? Yes, this drive can do that, at least in a concept prototype form: Hypocycloid Hyperdrive by the late great Robert Murray-Smith So, of course, I had to quickly model an educating toy version to get familiar with it. Attached are the Fusion360 CAD model (very messy), STEP and 3MF files. A few more details, naming dilemma and resources can be found in this post: https://raphtronic.blogspot.com/2026/04/diy-split-ring-joined-cycloids-drive-3d.html Happy printing to all ! CAD The first cycloidal stage holds 7 'teeth', the second holds 6, for a total reduction ratio of 6 x 7 = 42. The cycloidal profiles were generated via a Fusion360 script from woodenCaliper on Github and with the help of this video from Howey &