Aquarium Lid Half-and-Half Assembly

Create a functional aquarium lid for FDM 3D printing, using millimeters. Aquarium external size: 310 × 200 mm. Glass thickness: 4 mm. Lid requirements: - Internal fit: 311.5 × 201.5 mm. - Solid top, 2.4 mm thick. - No holes or vents on the top. - Outer skirt: 15 mm high and 2.4 mm thick. - Rounded outer corners, radius 5 mm. - Add underside ribs to prevent warping. - Add ventilation only on both short sides. - Each short side must have 2 rows of 4 horizontal slots. - Each slot: 28 × 2.2 mm. - Add downward-facing louvers if printable without supports. The lid must fit a 256 × 256 mm print bed, so divide it into exactly two parts across the 310 mm length. Join both halves with a 10 mm overlapping stepped joint: - 0.25 mm clearance. - Flush upper surface. - Joint must block direct entry of liquid through the seam. Designed for PETG, 0.4 mm nozzle, no supports. Do not change any specified dimensions. If a requirement is impossible, report it instead of modifying it.

Parameters

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.