abse/gameboy-advance

mechanical/fit-print/r52/R51-read-me.txt

R51 CLEAN REAR + R50 CONNECTED FRONT - LOCAL REVIEW

REAR SHELL
No internal fins, no removable combs, no modelled print supports, and no support blockers. Interior perimeter haunches and battery-seat undersides use continuous45 degree chamfers. Outer hand/grip contour, battery holder position, latch and connector arrangement are retained. One narrow inward seat sliver is trimmed; nominal battery-door bearing overlap remains4.9mm.

CASE HARDWARE
Four ISO4762 /DIN912 M3x12 socket-head cap screws, pitch0.5, fully threaded. Head nominal5.5mm diameter,3mm height,2.5mm hex key. Flat counterbores6.2mm diameter; clearance holes3.7mm. Bearing seat assemblyZ=-6.5mm, screw tipZ=5.5mm,4.5mm insert engagement,2mm clearance to blind end. Use12mm measured under the head;16mm would bottom out. These replace the old countersunk case screws. PCB/display/speaker/holder hardware remains unchanged.

LAB INVENTORY
M3 screw assortment: BOX10. M3/M4/M5 brass insert assortment: BOX133. The pasted list confirms generic assortments only, not the needed lengths, insert diameters or insert lengths. Check four M3x12 socket heads and M3 inserts matching the existing4.6mm OD x5.7mm long specification. Other M2 hardware is not confirmed by this inventory. Reference screw renderings use ISO dimensions, not a manufacturer-specific part model.

PRINT
Open each3MF AS A PROJECT in Bambu Studio. P2S /0.4mm /Generic PLA /0.20mm layers /tree(auto), Slim /30 degree threshold /build plate only. Keep the rear open rim toward the bed and the front face toward the bed. Supports remain necessary under broad rear roofs and other features; keep them enabled. Revised rear estimate14.671g supports,77.27g total,222.1minutes. Original user-settings baseline23.621g supports,85.35g total,301.7minutes. Native slice succeeded, plate warning empty, normal mesh repairs zero.

FRONT SHELL R50
The four front case-closing bosses are now permanently connected to the face panel across their former2.55mm gap. Screw/insert axes and blind bores remain unchanged. The baseline reported4 unsupported overhang regions; the revised front reports none under the same settings. Approximately0.38g supports remains elsewhere.

REVIEW
33 clearance/driver checks passed for the revised rear. Native geometry matches source CAD within0.000004mm. Physical print, screw selection, insert dimensions and fit are still to verify. Published assembly uses the same R51 rear and R50 front geometry and project files. The installed headless slicer retains stock T65535/unavailable-display diagnostics, distinct from its successful slice result.