Roller-style grinder

As much as I'd have loved to update the cover photo, all those parts still work so I can't justify printing new ones environmentally.

Remixed from this model.

This is my solution to the problems I've had with the original design, specifically with the drive mechanism. With the original design, I had two or three failures in under six months where a gear sheared off of the axle. With this version, I haven't had a single failure in three years. Altogether, it's more durable and easier and smoother to operate.

I redesigned the gears and shafts and made them separate so that the gears are now mortised over the shafts, making shearing failures much less likely. I've also widened the gears a little and added a second set to transmit more force, making turning easier. I added a thumb-turn because I found the crank handle really useless, it turns really poorly and binds a lot, and I preferred to turn it by the gear. If you still want the crank, there's a file for a gear with a recess for the handle and of, course, the handle itself.

You'll need to print the small gear twice. This uses the original body and rollers so you can print only the gears, shafts, and handle to upgrade.

Assembly requires 4 M3 screws (5 with the crank). I countersunk the screw holes in the gears but flat screws work fine, too.