5DOF robotarm with MG90s servos

thingiverse

update 20190910: upgraded arm width to 44mm and lengthened arm to 90mm, swapping out bearings for 1mm bearing for improved stability. update 20190822: introduced a reinforced servo holder for the base, replaced the gear on the SG90 microservo with a new one, and added a screwable gear for MG90S servo. update 20190819: upgraded servo holder V3 to a reinforced design. update 20190817: extended arm length to 90mm. This compact robotarm boasts five degrees of freedom (DOF) perfect for training purposes. The gripper is straightforward, but the shoulder MG90S struggles with high torque loads. Powered by an Arduino and a Sensor Shield V5.0 with a separate power supply for the servos, this arm demands top-notch servo performance. I experimented with various MG90S servos due to weakness in cheaper alternatives; 9g servos may suffice in the gripper and wrist. All parts except the gripper can be printed using a 0.5mm nozzle to minimize printing time. Attach the servos with M2.5 screws. To secure the robot, I poured concrete into the cube (Basis_logo), anchoring it firmly on students' desks. Happy printing!