PRELIMINARY concept only, do not print. Shaft: 12x100; middle keyway only, shaft end details omitted. Body axial overall 20; cam corner radius 21.7706; total swept diameter 43.5412 Clamping envelope including screw/nut and ears 33.4718 key: 4 x 4 x 12 hypothetical; local keyway depth shaft 2mm and hub 2.3mm, width 4.2mm. clamp gap 0.4mm, bore 12.2mm nominal; M3 clearance dia 3.4; cylindrical 6.6mm relief (nut captured only visually, nut rotation restraint not modeled). Calculated positive-volume intersections (mm3): upper-lower 0.00000000 upper-shaft 0.00000000 lower-shaft 0.00000000 key-shaft 0.00000000 key-upper 0.00000000 key-lower 0.00000000 hardware0-upper 0.00000000 hardware0-lower 0.00000000 hardware0-shaft 0.00000000 hardware1-upper 0.00000000 hardware1-lower 0.00000000 hardware1-shaft 0.00000000 hardware2-upper 0.00000000 hardware2-lower 0.00000000 hardware2-shaft 0.00000000 hardware3-upper 0.00000000 hardware3-lower 0.00000000 hardware3-shaft 0.00000000 Fastener hex socket and actual switch/cam clearance unmodeled; proposed material, deflection, load and tooling clearance not validated. 100mm shaft position is schematic, module, both bearings, motor connection and wheel are unmodeled; fit cannot be inferred.