AR4 MK5 combo kit

Annin’s AR4 MK5 combo kit is the complete robot kit: 26 machined aluminum pieces, bearings, belts, pulleys, shafts, pins, screws, and the primary electrical parts.

Motors and drivers, a gripper, and the 3D-printed parts are not in the kit. Annin lists those separately, including the $699 StepperOnline motor, driver and power supply package. The combo starts at $1,189.

The finished MK5 is rated for a 4.15 lb (1.9 kg) payload, 24.75 in (62.9 cm) reach and 0.25 mm repeatability, runs on a Teensy 4.1 with Annin's free Python software, and homes J1 to J3 with Hall-effect sensors. The parts kits are also sold on their own: aluminum $699, hardware $319, electrical $229, and SOLIDWORKS and STEP CAD models $99.