This question is very simple. The 3D printers that can be purchased on the basic market side use the STL file format as a standard graphic information input file. If you look at the format definition of the STL file, you know that there are only Cartesian coordinates, and there are no polar coordinates. More importantly, polar coordinates are very rare in the application of geometric image visualization. At least I have never seen an example of using point clouds or triangulation information in polar coordinates.