I would make it clear you need someone to design this for you. If you want someone to print for you, expect to pay. Be clear about timelines too.

Does your school have an engineering or design department? That would be a possible route to get designs printed. If this is for a project with a deadline, you could coordinate with one of those departments and maybe arrange a joint project. They do the design parts and you handle logistics and concepts.

I'd be interested in fiddling with this but don't want to commit to anything. I'm a hobbiest and could use the CAD practice.