robot arm 3d model

Mechanical CAD model of a robot arm. Focus on minimum mass, maximum stiffness, 3D-printable. Shoulder Base: Outer diameter: 50 mm Total width: 44 mm Main body thickness: 40 mm Boss: 2 mm left + 2 mm right, boss diameter 22 mm Shaft hole: 8.2 mm D-shaft Flat distance from center: 3.5 mm Locking: Top-down M3 set screw hole Filleted edges, no sharp corners. Main Arm Body: Center-to-center length: 130 mm Outer width at shoulder: 40 mm, taper allowed toward elbow Wall thickness: 5 mm Side pocketing: 15 mm from both sides, central spine remains Internal structure: 3 mm thick triangular lattice ribs, optimized for bending and torsion. Elbow / Servo Socket: Closed box type Inner width: 21 mm Inner length: 42 mm Depth: 25 mm Rear cable hole: 5 mm diameter Avoid solid mass. Use ribs, gussets, lattice. Structural efficiency over aesthetics.