3D Print Pass · Rectangular Packaging Template Starter Model: example-box-40x25x12.stl File-derived axis-aligned bounding box: 40.00 × 25.00 × 12.00 mm User-entered clearance around that box: 3.00 mm User-entered printed wall / base: 2.40 mm / 2.40 mm User-entered outer cushion allowance: 12.00 mm Each generic rectangular tray shell: 50.80 × 35.80 × 11.40 mm Calculated outer allowance (not a carton specification): 74.80 × 59.80 × 46.80 mm FILES - lower-rectangular-tray.stl: generic open rectangular shell for one half of the bounding box. - upper-rectangular-tray-flip-before-use.stl: the same generic shell; print and flip toward the part. - insert-opening-guide.svg: 2D opening and centering lines in millimeters; no material or depth design. - tray-fold-cut-layout.svg: 2D score/fold and corner-relief lines; no closure, tabs, or thickness compensation. LIMITS This generator uses only the supplied axis-aligned bounding-box dimensions and user-entered allowances. It does not inspect contours, mass, fragility, center of gravity, surface finish, material behavior, printer capability, carton construction, or distribution hazards. Verify physical dimensions and use a distribution-appropriate test plan before shipping. No protection performance has been calculated, simulated, certified, or guaranteed.