I needed a sturdy camera mount with robust threads that do not break easly when torqued. A printed M20 thread seems robust enough to me.
Of course I overengineered it and the result is a modular universal mount for cameras, action cams and smartphones. I added a normal stand and a clamp - see what is better for you. Print whtat you need and just assemble everything by using the M20 bolts. For the clamp I used a smaller M10 thread. The clamp does not need much torque so M10 should be robust enough.
The parts are optimized for 0.2mm layer height. You do not need support for the threads but for other sections of some parts. Adjust your slicer so that overhangs over 60° are supported. I set the support overhang angle in cura to 65° and everything prints fine.
Smaller foot added for 150x150mm printbeds.
I added the file "lower clamp xl.stl" for larger phones. It has 20mm more clamping length.