Delta U Joints Large and small

I have designed two sizes of the same style Delta U-Joint. I have yet to print and test these but all measurements are taken to accommodate either a 623zz bearing and 7mm rod, or a 624zz bearing and 5mm rod. I was looking to make a simple cost effective yet sooth running U Joint where you could purchase some carbon fiber arrows cheaply found online and convert those into push rods for your delta 3d printer.

The larger U-Joint also uses 8-32 screws and nuts while the small U-Joint uses M3 har