Printrbot Wood Extruder Gear
by barneyj, published
Who doesn't like the biohazard symbol? The hex is deep enough so a washer can be placed between the gear and bearing. This helps the gear clear any protruding screws.
The attached .skp has the hex head socket oversized by .4mm. It's a little looser than I expected but works well. Printed @ .2 layer height and .4 infill.