75mm "whoop" style quad case fits most 75mm quads M7, B75x, B75 Pro

thingiverse

I've been testing a case design for 75mm quads, and it seems to fit the Mobula7, Beta75X, and Beta75 Pro models just fine. Version one has a curved bottom, while version two features a grooved bottom that allows you to stack the lid underneath. When printing, I found that support is necessary for the bottom, but infill doesn't make much of a difference. I printed mine at 0.2mm layer height. Keep in mind that I don't create cases with built-in battery storage, as I have multiple quads using the same batteries and prefer to use a separate battery holder instead. You can find the design on Thingiverse at https://www.thingiverse.com/thing:3231043.