The file 'Saddle Surface 3D Printer Model' is (stl) file type, size is 50.5KB.
Download this file to get two halves of the saddle surface z=x^2-y^2 restricted to a circular domain. Oriented and optimized for 3D printing, although you have to glue the halves together later!
Design notes:
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Pringle_saddle_surface_on_circular_domain.stl | 130.6KB |