Higher-ratio evoloid planetary gear 33:1
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By stretching the rules just a little we can obtain still higher ratios. Violating the soft R=S+2P constraint allows…
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Originally remixed from "Hi-ratio evoloid planetary gear" by Parkinbot (thing:4127285)
We can obtain still higher ratios if we use evenly spaced planet gears with tooth counts which wouldn't normally mesh with a conventional ring gear. We can also squeeze in a few extra for good measure.
Note that the single toothed sun gear does not offer much in the way of stabilization of the planet gears hence this arrangement requires a carrier (and hence some post-processing).
Print in place at 0.2mm layer height (for layer jumps and progressive bridging), also optimized for 0.4mm nozzle. Separate carrier using a sharp edge after printing. I used 6 perimeters to add strength to the gears but also to allow bridging of the top carrier brace (see screenshot).
After printing use a razor blade or sharpened spatula to go around the edges to separate the carrier top and bottom plates. I have also added some holes to grab with needle nosed pliers to help break the seal and get the gears turning.