3D Model: Create A Rectangular Open-top Enclosure For A Microcontroller. The Internal Dimensions Should Be 100mm X 100mm X 50mm To Fit The Microcontroller. The Outer Shell Should Have 2mm Thick Walls On All Sides Except The Top, Which Remains Open. Add A Rectangular Cutout Slot (40mm Wide, 10mm High) On One Of The Longer Sides Near The Bottom For Cable Or GPIO Pin Access. The Enclosure Should Look Clean, 3D-printable, And Functional.