Olde Timey Spur Gear for Printrbot Extruder
thingiverse
This is a modification of Drawcut's spur gears for the (old style) Printrbot extuder. The large gear has been skeletonized in a manner reminiscent of a watchmaker's topping tool and the small gear has been beefed up inside the trapped nut with a flat spot for the motor shaft. Instructions I had to open up the hole for the hobbed bolt and shave down the hexagonal sides of the head of the bolt to get it to fit when printed in "Antique Bronze" by Shapeways, but that might not be a problem if printed in a nylon.
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