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 hardware.

As soon as I get a chance I will print and post pic's of the U-Joints with bearings and nuts installed

Kossel

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