I tried to fill it out, but it wouldn't accept "other" as a profession, even though I filled in the box. Also, your questions need proof-reading. It's hard to believe one is really contributing to scholarship when the questions aren't grammatical. Some of them didn't make sense even if they were legible - the choice of a method for prototyping something depends a lot on what it is you're trying to produce, which you didn't specify. A 3D-printed model is good for some things, but not everything. If you need to find out about the load-bearing characteristics of a steel structure, FEA analysis will work better than a plastic prototype. If you're making a hand-made object, it would be a waste of time to make a 3D model and print it.

Try again, think harder about what you need to know, and try doing the survey yourself before inflicting it on the world.