Hello! I am interested in 3D modeling/printing flat based solids for calculus. I would like to use the parabola x = (y^2)/9, or something similar, to determine the cross section. I really liked your models, but I wanted the full parabola shape. I want to use the cross section as the diameter of semi-circles, the leg of an isosceles-right triangle, and the base of a rectangle (with a height 2x the base). Do you have any tips for how I could model these? Thanks for any help you can offer!
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I used Wolfram Mathematica to make my cross-section models using parametric equations. If you want flat regions, you could try using a CAD program and then stack them together. The code I used was something I had written many years ago and it was fun to adapt it for actually bringing such models to life.