The cost will depend on the type of part and how many of them you need. The usual home project needs one or a few, so making them by the usual technique of injection molding is not cost effective.Has anyone ever needed custom plastic parts made for a project? How would you go about taking a design in your head and turning it into a custom plastic part for an electronics project without having/knowing CAD and that doesn't cost a ton of cash?
What glue do you use for acrylic? I glue larger thicknesses of acrylic (say 10mm thick clear perspex sheet) and have yet to find a glue that gives decent strength....
The nice thing about plastics are that they tend to be easy to machine and some can be easily glued together (I like PVC and acrylic for that purpose).
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