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answered 2020-09-08 15:44:56 +0100
This is much simpler now, just do :
sage: x,y,z = var('x,y,z') sage: a = implicit_plot3d(x^2+y^2+z^2-9, [x,-5,5], [y,-5,5],[z,-5,5]) sage: a.save("foo.stl")