This is a Logitech G560 bass leg. Mine broke so I made this quick model as a replacement. The tolerance for the screw might be a bit tight but with a screwdriver you can push it right through. The official speaker legs have two nibs where to prevent the leg from unscrewing due to vibrations and other reasons but I didn't bother to include it in my model. Maybe in a V2.

Note: Please raise infill to a value over 50% so the structure is sturdy.