UMX Turbo Timber Prop Hub ( Long Shaft )

Manufacturer doesn't like to carry stock so this solves that problem.

I printed mine with PETG only because I had some laying around.  I'm sure any other type of filament will work just fine.    I used 100% infill and supports touching build plate only because of the hole for the small motor shaft that will need to have access. ( Note: You will not see the hole go all the way through.  I did that just to show you what I was talking about.    The infill was easily removed with a tiny jewellers flat head screwdriver.   I also used a 1.65mm drill bit in a pin vice to enlarge all of the holes just a wee but so the screws would fit. 

I tried to break one where the originals always break and couldn't easily do it so that's a bit of satisfaction.