This tiny gearbox works on a principal not seen often in mechanical design, given the number of sliding components and the amount of slop necessary to keep it reliable. This is a conceptual design and has not been tested. It is designed with printing in mind, but my experience with printers is limited and out of date. If you do want to print it, please leave any feedback in the comments. All input is much appreciated.
Note that I have added no supports. Given I am using Tinkercad, I have no software to create supports, so anything must be added by manually designing them myself. Obviously, this is a major pain in the behind, so I will leave it to whomever prints this to use their software.