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Since I started playing around in Fusion360 and have a reliable 3D printer equipped guy, I would like to design my own 3D printed round-to-conical 1″ compression driver adapter, that would allow mounting cardboard/EPS/plywood sides for easy construction. I think I saw something like that already, but I cannot find where it was.

What would be a good angle to start? 60×40, 60×60 or 90×60? And like with all my amateur 3D designs, I will be happy to share the result here.