Printrbot Original Improved extruder spur gear Greg Wade's

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 edi