NOTE : It seems the plastic "fingers" lose their springiness over time, causing more and more slack in the mechanism. I have as a result, stopped using this mechanism. I tried both ABS and PLA - maybe someone will have more luck with other materials. Let me know! Carrier, arms and platform for 3D Delta printer using child's marbles as the universal joint. Easy to print and cheap to build. Zero play (so far - will see how it ages) on the mechanism. Assembly is literally a snap! Video of the mechanism working: https://youtu.be/7Wg3nl67Hnk Carriage currently has no provision for an end stop screw - sorry! Edit 1: Added V2 Carriage. My rails are slightly wider, so I moved the bearing holders. Moved the lower cable tie holder down and added better grip for the cable ties. Also now features a platform for endstop triggering.Printed 0.2mm layer height using PLA. Print two of the arms per arm (so a total of 12). They bolt together using 3mm bolts to form one arm. Added mouse ears to stop the middle point from curling up - those can just be cut off. Claws are designed for +-16mm marbles. Fit should be snug but not over-tight. I used no lubrication, but it's your choice.