So let’s say I want to build a mouse and keyboard (just with some very specific altercations) What software would I use to render a 3D shell for the mouse housing for it to them be printed off as a prototype? Basically what software and also what company for 3d printing without spending an arm and a leg.

And after the prototype is built how would in then move from 3d printing to, I guess a mould? Of the product to have it manufactured? How do I even approach this part. Thanks!