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Very nice stl. I have prinded the head and Tail_Set_20.stl
I can not connect the elements together.
Yoi said "4) if you have trouble the Ball into soket, grind or shave ball's top and bottom about 1mm and try again."
Should I sand the head of the ball or the hole of the ball?
Should the element be able to move once click?
Are the elements all the same size?

Thanks