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Mathematica supports Export of to the .stl format used by many 3D printers....up to a point. Recent posts explain that .stl can only take graphics files made up of triangles. The posts provide workarounds for special cases. But the user has no way...
I have a complicated function called potential[x, y, z].  If I evaluate it at any specific point, it gives a numerical answer.  The explicit formula used depends on the location of {x, y, z}.  [mcode]In[56]:= potential[3.5, 5.4, 0] Out[56]=...