Custom 3D Model STEP/STL

I have an idea that needs to move quickly from concept to a physical prototype. I do not have any sketches or prior CAD work, so I need you to create a complete 3D model from scratch in AutoCAD (or a fully compatible platform)... (Budget: €8 - €30 EUR, Jobs: 3D CAD, 3D Design, 3D Drafting, 3D Modelling, 3D Print Design, 3D Rendering, AutoCAD, Solidworks)