Raspberry Pi 3 B+

grabcad

I made this for a project i was working on. I took most of the dimensions from this website: https://www.raspberrypi.org/products/raspberry-pi-3-model-b-plus/ under documents. All dimensions on the mechanical drawing given on that website were implemented in this model. The rest were guessed on so if you need exact dimensions you'll have to buy a real pi but if you just need a representative model this might help you.