Spinner for my 20cc RC Funtana. It is 70mm in diameter and designed to fit onto the Al backplate of a commercial spinner (I just wanted the colour to match my model).
I also designed the backplate if you want to print that as well. Spinner is for 8mm shaft, and cutouts are for a 17" x 6" 3D prop (Sail brand).
Included the Fusion file, if you what to "play" (sorry for the crude design...newbie...).

Please be aware of the safety concerns when dealing with power engines rotating at high speed. Also note that PLA is not UV resistant and so may be age and become (more) brittle on exposure to sunlight.

Just added a spinner for my DLE 30 (10mm center bore, 2 x 4mm holes on 26mm pitch circle)..
Also added a jig for drilling a standard centre bore prop, for a DLE 30. The centre guide is 9.5mm, and was a little too loose (maybe 9.8mm would have been better). The holes are 4.5mm and should maybe be a little closer to the 4mm required. Since it is only plastic, you may need to print a new one for each prop you drill. Alternatively you could oversize the holes and insert steel tubing to make a more robust jig...I didn't have the time or the inclination and it worked OK for a "one off".