I've been in the industrial design field for about 20 years and was not always a designer throughout. Basically, was a contractor for about the 1st 4 years and was offered a full time modelmaker at one of the largest design and engineering firms in the bay area. Did that for about 5 years as the economy tanked and got laid off as a result.
Went back into design and worked for various companies designing anything from exhibit truss configurations to POP cabinet displays. Throughout my career, I managed to learn Vectorworks, AutoCAD, and Rhino 3D. Was laid off between jobs until recently where I was offered to be the model shop/prototype manager at another large design/engineering firm. Here, I learned how to program and operate the venerable CNC machine by myself using SurfCAM and Rhino.
If you're getting into prototyping, my suggestion is to research the kind of programs and fabrication techniques you want to get yourself into. Right now, Solidworks is very popular for most designers, following rhino. But, it all depends on what industry you get into. I used to use AutoCAD and Rhino alot when I was designing POP cabinet fixtures for a well known greeting card company. And Vectorworks when I was designing truss exhibit configurations for tradeshows.
Any software you learn or get trained on, you will find a niche/industry sooner or later. Good luck. rudy
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