My mate Sean from Provulution bought a board from me a while back. He runs a 3D printing business full-time and started experimenting with fins. I visited him this week and checked up on progress. He's made these really interesting fins for his board. He describe them having a nice soft feel with an incredible turning ability. The fins are very robust yet they have a stiffened flex. Will be interesting to see where fin design will go with these new machines.