MM3 Rambo Mount

I had clearance problems with the rails used to mount the Rambo board in the MendelMax 3.0 kit. So I created the mounting parts, shown in yellow in the photo, that provide a much better fit. The top extension adds 1 cm reach so the mounting rail doesn't hit against the Y stepper motor mount. I created slots in this part so you don't have to get them mounted perfectly.