All my designs & progress available @ Marginally Clever Video Scale model of a 4 armed delta robot used in automated manufacturing. I'm looking for better ball joints. A universal joint that mates to M3 would be fantastic. If you use one of my designs, please let me know! I'd love to see what you make with it and share with others who are interested.Kit with all parts available at http://marginallyclever.com. Acquire four sets of http://www.pololu.com/catalog/product/733 Acquire four hobby servos. I used TowerPro SG5010. Acquire an Arduino UNO or better. Acquire a 9v1a power supply. Acquire a small breadboard. print one end effector, four bicep, and four mounting brackets. CAUTION! Mounting brackets in the pictures are flipped on the X axis. The uploaded model has been corrected. Your robot should look like a mirror image of this one. Assemble as in the photographs. Hot glue the servo horns onto the biceps. Upload the code from the github project @ https://github.com/i-make-robots/Delta-Robot after you change NUM_ARMS to 4. Share your experience in our forums @ http://marginallyclever.com/forum/