Shoulder Motor Hanger Bracket
A C-shaped bracket from the 'NEMA17 Belt-Drive SCARA Drawing Arm' kit. It hangs the shoulder NEMA17 shaft-up under a 5 mm top plate with a 31 mm square M3 pattern. The M3 holes are 3.4 x 9.4 mm slots and the pilot opening is a 23 x 29 mm obround, so the motor can slide ±3 mm to tension the 3:1 GT2 belt. The part is 59 x 56 x 55 mm. It bolts to the base's 40 x 40 mm heat-set pattern with four M3x10 screws, leaves 45 mm between the foot and the plate for the motor body (motors up to about 44 mm long), and prints lying on its back wall with no supports.
robotics kit nema17 scara