This is for a fairly obscure bicycle bottom bracket I came across. The one I had was a mix between the old style adjustable cups and newer cartridge type. Because it still uses lockrings, the tool itself doesn't need to take much force, I only needed it because the threads were in poor shape.

You'll need a large adjustable spanner (or a 37 mm wrench), or you could probably modify the scad file as needed. Print with no extra shells and 100% infill for best results.