Here's a simple Cinewhoop frame for 3in props. It has mounts for most major types of stacks (20x20, 30x30, whoop style).

I included a version with full ducts and one with open ducts (really just prop guards) as well as a clean top plate and one that should mount to the standard GoPro camera mounts.

This is meant to have M2 brass inserts used in the screw holes for the top plate to hopefully increase its lifespan. M3 screws might get enough grip to be usable but I think that will mostly depend on how your printer is tuned.

The only parts of this that might need support are going to be the top plate as there is an indented section to make room for the battery strap.

I printed mine in PLA+ and so far I'm really happy with the results. I expected it to vibrate badly like a lot of other printed frames but so far I haven't noticed any bad characteristics like that.

Only major irritation with it so far is that I had to get a 90degree USB cable so I could hook it up to Betaflight.

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