You don't need a 3d printer. Access to a laser cutter will suffice.

Not sure if you meant this as a joke (a laser cutter is probably harder to come by than a 3d printer). But back in my day for things like this we simply used a jig saw to cut out parts from wood or plastic. Anything more complex would need several pieces cut out and glued together.

Just curious, how much you'd pay for the 3d printed parts?

With a kit containing all the required components, along with instructions perhaps something like $30, but I'm not sure the cost of such things.

> access to a 3D printer.

Time to meet your local hackerspace perhaps?

Or library! Some libraries have them.

libraries are thinkerspaces.