So I found this a very interesting gearbox concept that is a challenge to print and assemble. I printed most parts twice to get the fit spot on and decided it is a very good calibration tool, as print quality and sizing is critical getting it to assemble and work well. If anything is out, it either won't fit together or will be very tight. Get the fit right, and it works very well... there is very little slop and very little drag. Great job of thinking it up and drawing it.