T-slot ball joint connector

Connects ball and socket chains to 20-series t-slotted aluminum extrusion. My delta printer has t-slots, and this connector allows small or temporary items to connect to the frame of the printer.
It's intended to fit 20-series t-slots that have a 6mm external slot that opens inside to 12mm. I had to slightly modify dimensions to fit well with my printer, so it's possible some scaling would be needed on another printer. The OpenScad file is attached for additional changes.