I got 4th in Washington state for a statewide 3D CAD high school competition this year and I must say thet you're totally right. It would be increadibly hard to make vex in any 3D CAD software detailed enough to make it 3D printable (except maybe rhino, but even then it would be quite a task.)
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I work in the industry (uk) and I design various art and prototypes....There expensive...really expensive lol