This is my 3rd revision of my 3 speed transmission for the Moving Parts contest.
It has a first, second and third gear with a small crank on the input shaft and a small propeller on the output.
The shafts and gears have 0.50 mm of clearance all the way around, so about 1 mm of total clearance, or a 3mm axel fits into a 4mm bearing.
In this revision, I have made some cut outs on the gears to save in material and moved some of the parts so that they can be printed and will fall into place when finished.
I also added material relief slots next to the axels so that it was easier to get the support material out.
This project is probably best printed in the White Detail material, but WSF should work as well.
Feel free to give me a rating or ask me any questions!