Design files for this project can be found hereParts have been designed to be 0.3mm larger. This should be taken taken into account when printing.
Here’s a gearbox that I made for testing purposes back when I was designing my improved filament extruder. Comprised of ten parts, this low-tolerance gearbox is spec’ed to have no backlash between the gears if properly printed. If the annular gear is held, the sun gear and carrier will rotate at a 4:1 ratio. If the carrier is held, the sun gear and annular gear will rotate at a 3:1 ratio. For more information on 3D printed gears and/or epicyclic (planetary) gearboxes, see the bottom of my post on the NEMA 17 gearbox project page.
- 3x 10mm M3 Bolts
- 4x 16mm M3 Bolts
- 7x M3 Nuts
Printing and Assembly Notes
- 100% infill may cause parts to be too big, resulting in increased friction between parts
- Layer height of 100 micron and print speeds of less than 50 mm/s is recommended
- Batch printing all pieces at once is NOT recommended
- Teflon lubrication should be applied between all moving parts
- Retraction MUST be enabled for gears to be properly printed
- Using my custom filament extruder and fan mount will result in higher quality prints
- Simplify3D (v2.2.0) was used to slice the model for printing
- My custom UM2 profile can be downloaded here
- Other slicing engines may result in non-ideal prints!
- Gears may be difficult to turn when first assembled, it takes a bit of time to break it in
- Assembly is fairly easy and is left as an exercise to the reader