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Very nice! 3D printing is a great way to make molds for thermoforming. For other folks reading this, I'd make the following comment--the ridges we get with 3D printing (especially when the ridges are parallel to the thermoforming platform) could make it extra difficult to extract the mold from the finished part. So add additional draft (sounds like 10 degrees worked well?), and/or use whatever technique you like to smooth out the ridges so the sides don't grip as much. A mold release agent probably wouldn't hurt either.
This was never a 3D model--just the 2D layers I posted above. You can read the PDFs into a vector graphic program like Inkscape, generate DXFs, and then use something like Fusion 360 to make a 3D model by extruding the DXFs. Good luck with your project!
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