CONCEPT ONLY: PCD50/PCD76 phase45 and slot9.5x5.5 assumed. Corners flush to motor, moved 2.5mm outward from slot midpoint; 4mm screw nominal slot-end clearance 0.25mm. Pillars 0.5..10.9mm and panel 10.9..14.1mm; closed Ø4.4mm bore. M4x20 nominal screw engagement in motor 20 - 14.1 = 5.9mm, true tapped depth unknown. Pillar cylinders Ø9 extend from z0.5 to 14.1 and merge through panel; clipped at z0.5..3.21 against expanded corner projection 0.2mm. Minimum low-side wall near angle ~0.54mm theoretical, no print/strength guarantee. Estimated head bearing material by sampling (mm2): 24.00, 24.00, 24.00, 24.00 Selected positive-volume intersections >0.001mm3: none Tool envelope Ø7.5: M4 tool 0: no checked obstruction M4 tool 1: no checked obstruction M4 tool 2: no checked obstruction M4 tool 3: no checked obstruction 76 M4 tool -1,-1: no checked obstruction 76 M4 tool -1,+1: no checked obstruction 76 M4 tool +1,-1: no checked obstruction 76 M4 tool +1,+1: no checked obstruction Low-bore shell check (positive shell is expected): Pillar0 z=1.0 closed-bore surrounding shell missing samples: 0/72 Pillar0 z=13.0 closed-bore surrounding shell missing samples: 0/72 Pillar1 z=1.0 closed-bore surrounding shell missing samples: 0/72 Pillar1 z=13.0 closed-bore surrounding shell missing samples: 0/72 Pillar2 z=1.0 closed-bore surrounding shell missing samples: 0/72 Pillar2 z=13.0 closed-bore surrounding shell missing samples: 0/72 Pillar3 z=1.0 closed-bore surrounding shell missing samples: 0/72 Pillar3 z=13.0 closed-bore surrounding shell missing samples: 0/72