Summary Adapter for an odd-sized carbon fiber rod to ball-link end. It's for a scratch-built Delta printer I have in the works. If everything turns out I'll post the design files for the complete printer. Designed for a 4mm carbon fiber rod ordered from Goodwind Carbon Fiber and Traxxas 1942 Rod Ends. Instructions Printed with .2mm layers, approximately 15 minutes. Set of 12 took just under 90 minutes to print on a MakerBot Z18.