- 1/8 inch carbon fiber rod http://www.amazon.com/Carbon-Fiber-Rod-40-125/dp/B000BRFWOG/ref=pd_sim_t_1?ie=UTF8&refRID=02Y5NFA0MS6MCVFBWH1T (make sure you don’t order direct from China, as it may be on a slow boat and take a month). - Hinge pins are rivets that are made from 1/8 inch filament and melted on the end with a soldering iron. (Small $10 packs of 3mm filament sticks can be obtained from 3Doodler if your printer uses 1.75mm.)