Printrbot Original Improved extruder spur gear Greg Wade's
thingiverse
This is an improvement on the spur gears created by Drawcut. I had problems with the small gear cracking near the nut so I added some extra material around it on the side with the nut. It is designed so that you can still slide the gear on and off without taking the motor off or the other gear. You just align the gear so that the side with the extra material doesn't run into the other gear teeth. I use this on my printrbot original and it works great so far. By the way, if you ever want to edit an STL file, TinkerCAD is the way to go! Super easy to pick up and learn. Print with 100% infill in the orientation shown. The gear teeth overhang so they will start out sagging, but it will be fine after a few layers.
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