This is an AR Drone gear I created out of necessity. I print it on a Dimensions 1200 BST, and it does spin, but needs more work. I would think to perfect it you would need to make the teeth smaller, or replace the metal gear on the motor. I will test and improve it further. This was made specifically to print and replace a broken gear, but you would need to replace all four to have a chance. The teeth printed on my printer, a Dimensions 1200 BST were a little too big.If anyone improves on this, i would be interested to see it.It does fit properly though. Reverse engineered via the old ruler method.-AJ