compact mechanical keyboard 3d model

compact 40% mechanical keyboard interior based on custom layout, open case design, top plate with exact key grid: ESC, F1-F4 row, numbers 1-4, QWERT row, ASDFG row, ZXCVB row, arrow keys on right side below ENTER, spacebar at bottom, no right shift key, minimal layout detailed internal structure for 3D printing, separated parts: top plate, bottom case, PCB placeholder, battery compartment, mounting posts and screw holes, cable channel for ribbon cable, switch plate with MX-style switch cutouts (14x14 mm), stabilized spacebar mount uniform wall thickness (2-3 mm), reinforced corners, clean geometry, no overlapping meshes, watertight solid model, optimized for FDM 3D printing, chamfered edges, tolerance gaps for assembly matte plastic material, realistic proportions, industrial design, exploded view optional, high detail, CAD style, functional design precise dimensions, engineering model, CAD accuracy, functional mechanical design