Snap-Socket Linkage Rod
A flat link, 87 x 17 x 8 mm, with two snap sockets 70 mm apart (centre to centre). Print ×3 for the 'SG90 3-DOF Ball-Balancing Platform' kit. Each Ø17 mm ring has a Ø8.6 mm bore with a Ø10.4 mm double-cone band in the middle and a 1.5 mm split slot, so it clips over the Ø10 mm ball studs on the SG90 Ball-Stud Crank Arm and the Tray Ball-Stud Knuckle without screws. PETG is recommended so the rings flex without cracking.
robotics kit ball-joint linkage