C-3PO arm - large printer

This is an arm model I made mostly from picture analysis, but based somewhat on Starbuck Cylon parts and Gordon Tarpley's YouTube vids. The forearm is all one piece and the bicep is two. This was done to get a flat surface from which to start. The two pieces key together for alignment. This is intended for a large format printer like the CR-10 and I'm posting another version that might be more appropriate on smaller printers. I used 35% infill but it honestly probably doesn't matter too much where that's set. Most of the shaft is solid.

The forearm and bicep cuff are the same on both arms. The bicep body is handed so you'll want to reflect it when you print the left. The bar across the bottom of the bicep body is how the cuff is located rotationally so once you glue the parts together you can just trim that and sand it flush to the inside of the cuff. It also provides a little more surface area to adhere the part to the bed.


2/16/18 - update
I changed the holes at the