Dogbone Cup and Driveshafts for 3D Printed Rc Truck V4

Mr Crankyface's 3D Printed Rc Truck V4 [ https://www.thingiverse.com/thing:2935751 ] is an awesome design but I found the driveshafts (and specifically the u-joints) to be too fragile. The dogbone cups are designed to replace the U-joint parts and if printed properly will slide right in place on the pinion gears and so forth.

The driveshafts are still pretty experimental and may not hold up to much use, I don't know yet. I am also working on a set of dogbone cups sized to fit commercial (