I love the Molecule Lamp but I think it could be printed quicker and with less parts, so I took the original design which requires 3 pieces in order to join 2 of the main pieces, so I designed this piece to be printed in a single go.

EDIT: I got a message from @3dnetic (the original designer) and got the reason for the 3 part coupler system. It's because you might want the lamp to be connected in a specific angle, the 3 piece setup allows for that, this solution doesn't.