Propsaver - model plane prop saver for 3mm shaft and m3 drive nut

thingiverse

Prop Saver Installation: First, print the Prop Saver model and run a 3.5mm drill bit through its central hole by hand, typically a manual process. The Prop Saver fits snugly onto a 3mm shaft with one M3 nut securely driven into it. To secure the propeller in place, loop a rubber band or an O-ring around the prop and Prop Saver, holding everything together. This setup should allow the propeller to detach safely during a crash without causing damage to the driveshaft or prop itself. Post-Printing Instructions: Next, carefully clear out any debris from the central hole using a 3.5mm drill bit.