Connection Ball Thingy

No, it's not a naval mine, although the design is probably ideal for detonation at aft ship rather than at the bow.
The "Connection Ball" is a result of an impossible design task to create a new joint for 20mm x 20mm square profiles / pipes ?!? The term "NEW" gave me a headache for a week.
The Ball / Mine has 30, 60, 45, 90 degree sockets and all other angles possible
HOW TO USE:
-The cross is inserted
- turned clockwise
- pulled upwards
- locked by the cuff (threated)
- the inside pin is pushed upwards (space for spring is available)
- The cross will lock the thingy at the end.
I decided to upload it, because we will probably have to wait for a way to convert energy into solids, before we can print this model in metal. I invite you to proof me wrong :-)
Please contact me if you need the high resolution model. I will try to upload it...