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Did you look at the doc of save ?

sage: var('x,y,z')
sage: P=implicit_plot3d(sqrt(3*x^2+y^2)-z, (x, -30, 30), (y, -30,30), (z, -10,40))
sage: P.save?

This offers several formats, such as .x3d that could be possible inputs for other 3d software.