3D-Printable Solar Kit Housing for selling in my shop

I need four separate enclosure designs for the small solar-power kits I sell. Each housing must arrive to me as ready-to-print files—STL is preferred because most on-demand printing services accept it, but OBJ or FBX backups are welcome if it makes your workflow easier... (Budget: ₹600 - ₹1500 INR, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Print Design, 3D Printing, 3D Rendering, AutoCAD, CAD/CAM, Fusion 360, Solidworks)