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Of course it's true. But you have to be very good, knowledgeable about manufacturing processes, be able to listen to what your customer wants, and most importantly, be fast and communicate well.

Just being able to make CAD models in itself is not enough for you to make money. Theres a lot that goes along with it.

Thanks for your reply, J cole

You can see or just try it immediately in fiverr.com for reference. There's a lot of people do that on this website for freelance.

but, in Fiverr, it's more like you make what they want, not them wanting what you make. it sounds kind of the same, but it's totally different.