I proudly present: my curved helicopter cube. Or just Curvy Copter.
It is a variation on Adam's Helicopter Cube (get one now!) which shows the internal center pieces and forces them to be oriented correctly. This makes the puzzle even more difficult.
I'm very pleased with how it came out. Turns smoothly, it's unpoppable, takes misalignments well, it's just perfect. Except for the natural stiffness of SLS, but I suspect it'll get even better with time.
So, without further ado:
It's the same size as a regular 3x3x3 cube and about the same weight. I'll take a video showing the turning tomorrow when the sun is out. It will be available from my Shapeways shop, but I'm not quite ready to put it on there let. I'll let you guys know.
The mechanism is a heavily modified V-Cube one.