Doesn't look attractive nor sophisticated in your view. This tit bits of plastic hub caps designed for 3D profile planes or Multirotor FPV/UAV models does wonders and solve much of home made 
Multirotor/UAV drones.
This is proppeller center hub cap, designed to help "centering" any commonly used proppeller (shaft sized*) that uses proppeller saver adapter/rubber tied type adapter to lock the proppeller into the motor shaft. COmmercially marketted prop collet/saver locks the prop but it doesn't completely centralized the position of the proppeller hub parallel to the motor shaft unliked bolted type proppeller adapter/collet. Slight nano milimeters off-set the center hub causes the prop to spin unbalance and will wobble/jello the onboard video camera. By inserting this simple little hub i designed helps to equally spaced the distance between the center motor shaft and the proppeller hub so the whole rotor well balanced and spin smoothly.
Dimension details:
- Motor shaft diameter size: 0.3cm.
- Inner proppeller hole/hub diameter size: 0.53cm.
- Inner insert/sink cyclinder length: 0.5cm.
- For proppeller that uses prop saver type adapter.
- Fits on popular GWS type proppeller HD/SF with prop size between 8"~12" for multirotor or profile 3D plane.
Object view:
How to:
After normal proppeller installation on the prop saver/collect, just insert the hub cap above the motor shaft and press down towards the motor and propeller hub till tight fit.
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Download the *.STL 3D printing file below to proceed.
Download STL file for 3D printing