Frame is all OpenBuilds, 1000mm C-Beam for the base, 500mm 40x40 Linear Rail for the vertical supports and 24x40 to span the sides. Gantry is floating on OpenRail. Duet 3 using 5 Trinamic 5160 stepper drivers running at 3.5 amps per motor. Auto leveling with BL Touch. This printer is strong and, tough!