FDM Watch Box with Acrylic Lid & Interlocking Dividers

Create a precise, FDM-printable solid CAD watch box with separate bottom, hollow acrylic-window lid, and four removable interlocking dividers. All dimensions in mm. **Dimensions:** Bottom 241×241×80 mm; interior 232×232×75.5 mm; walls/floor 4.5 mm; exterior corner radius 6 mm. Lid 241×241×30 mm, with 4.5 mm top and side walls, 25.5 mm side-wall height above the bottom rim. Closed height exactly 110 mm. No overlapping skirts. **Interior:** Sharp 90° corners and floor-to-wall transitions, flat floor and perpendicular walls. No internal fillets, chamfers, ribs, grooves or protrusions. Designed for velvet lining. **Lid window:** Centered rectangular opening with approximately 10 mm frame. Add an underside acrylic recess for 2 mm acrylic: 2.3 mm deep, 0.2–0.3 mm clearance per side, 4–5 mm supporting ledge. Keep the recess closed at the top; acrylic is separate and adhesively installed. Window dimensions must be configurable. **Hinges:** Two external metal hinges, not printed. Provide reinforced, aligned rear mounting pads. Keep hole sizes and positions configurable; do not create unverified screw holes. Ensure collision-free opening and closing. **Dividers:** Four separate 232×45×3.5 mm parts: two Type A with two downward-opening top slots, two Type B with two upward-opening bottom slots. Slot centers 76.75 and 155.25 mm from one end; depth 22.5 mm; initial width 3.8 mm, configurable. Type A/B differ only in slot direction. Assemble externally as one removable grid; no floor slots, rails, glue or snap-fits. **Compartments:** Exactly nine equal 75×75 mm clear footprints. Divider centerlines 76.75 and 155.25 mm from corresponding walls. Verify: 3×75 + 2×3.5 = 232. All divider edges must be coplanar; grid must fit and lift out as one unit. Optionally create slot tolerance tests at 3.6, 3.8 and 4.0 mm. **Validation and output:** Check actual dimensions, assembly clearances, lid movement, acrylic fit and divider geometry. Ensure watertight manifold solids without self-intersections or unintended cavities, suitable for FDM printing. Export four separate STL files: `watch_box_bottom.stl`, `watch_box_lid.stl`, `watch_box_divider_A.stl`, `watch_box_divider_B.stl`. Preserve millimeter scale; do not fuse parts. Provide editable CAD, assembly and drawings if supported. Never claim unperformed verification.

Parameters

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