SnapKit Modular Base + 3 Modules

Create a beginner-friendly, 3D-printable physical prototype for a modular computer concept called SnapKit. Use millimetres. Create four separate parts: 1. A rectangular motherboard base, 120 mm × 80 mm × 4 mm. 2. Three interchangeable square modules, each 30 mm × 30 mm × 15 mm. 3. A simple mechanical locating system so the modules fit into the base and can be removed by hand without tools. 4. A small orientation notch on the motherboard and a visible arrow on the SSD module. This is a non-electronic concept prototype. Do not include real electrical contacts, batteries, CPU sockets or functional electronics. Keep the geometry simple, use rounded edges where appropriate, and make the parts suitable for ordinary FDM 3D printing. Generate separate editable CAD parts and export an individual STL file for each part. Make sure all dimensions are in millimetres and the modules have suitable clearance for a real 3D printer. Explain any assumptions about the fit before finalising the files.

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.