C-3PO arm - small printer

thingiverse

I designed this arm model primarily from picture analysis, but drew inspiration from Starbuck Cylon parts and Gordon Tarpley's YouTube tutorials. The forearm is divided into four sections, while the bicep consists of two pieces. This design allows it to be printed on printers with shorter print capacities. The three main forearm pieces are designed to nest together like a Russian doll, making them easier to print at once. They fit together perfectly for precise alignment. I posted another version that may be more suitable for larger printers. I used 35% infill, but it doesn't seem to make much of a difference regardless of the setting. Most of the shaft is solid material. The forearms are identical on both arms, while the bicep parts have handed versions, so be sure to mirror them when printing the left arm. The dimples at the elbow create a continuous bead for the entire layer and provide a positive locating feature for drilling clean holes. I also added a small nub on the outside of the elbow to locate the piston anchor. I will be uploading the remaining greeblies and parts to complete the assembly.