This is a replacement gear for the Robovac 11+, specifically the drive gear that directly attaches to the wheel. 

I created this replacement part as the original had literally cracked in half. While it is often possible to get entire replacement units for other Robovac models, for some reason I found it incredibly difficult to source one for the 11+ so I ended up creating a replacement gear. This was in fact one of the main reasons why I got a 3D printer in the first place, because I thought it was incredibly dumb to throw away a $150+ vacuum because of one busted part so I bought a $150 3D printer to make parts to fix it!! “Logic” aside, little did I know that this was really just a gateway drug into the 3D printer world…

Creating this part was relatively simple. I used Fusion360's gear creation tool as a starting point with some basic dimensions measured with calipers, and then added the keyway, flange, collar, and retention features. This part is printable as-is without supports and I found that actually, PLA works pretty well for this application. The component I had printed still works after multiple cleaning sessions with basically no signs of wear, even though I apparently didn't re-install the gasket properly and some debris got into the drive module.

In order to install it, you have to break off remnants of the old gear from the steel shaft. Then, gently hammer this piece until it locks into place on the shaft. If you're finding the fit so tight that the gear starts to split, you may need to modify it for your printer/filament, in which case I included the .f3d file for convenience.