3d 打印 lithophane 盒子

Create a rectangular lithophane lightbox enclosure designed for 3D printing. Inner opening for lithophane: width 148 mm, height 112 mm. Wall thickness: 2 mm on all sides. Bottom thickness: 2 mm. The box should have a rear cavity for an LED strip, with an internal depth of about 20 mm. Add a 3 mm diameter circular hole at the center of the back panel for passing LED power wires. The front side must have an internal slot or lip to hold a lithophane panel securely, positioned between the lithophane and the LEDs. The top side should be open or slotted so the lithophane can slide in from the top. Design should be minimal, functional, and printable, with sharp edges, flat surfaces, and no decorative details. Output must be a single solid STL-ready model, with no textures, no fillets, and no overhangs requiring support.