15x15 mm camera Mount ball joint for profil system square round tubes

15x15 mm system for square round tubes from DIY store

Inside Dimension = 15.5 * 15.5 mm
Nut Size M5
Nut internally

M4 ball joint

Easily printable, very stable
0.8 mm shell and 25% filling enough .

Make for the camera Thread the outer shell thick enough!

For aluminum hollow section profile is the weak point.
Tighten the screw only slightly.