Expensive yokes.
Split the idea in two if you can - the design process and the printing. You can outsource the printing part to start off with. As for design, well it's easy enough to purchase a design and then use some CAD software to play around with it while you build up your knowledge.
If you don't have CAD knowledge try a course, maybe your local Institute of Technology might be able to put you on to a suitable evening course.
I'm sure it would be a great project for kids and adults alike.