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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.
Printrbot Wood Extruder Gear by barneyj is licensed under the Creative Commons - Attribution - Share Alike license.
So what's this mean?
We're sure barneyj would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!