You do not have to spend 20K to do a pipe cutter. For round or square you can use the Rotary Plasma Plug-in for SheetCAM (85 bucks) and it will auto-scale the shape to be correct size on the surface of the pipe / tubing.
It presents you a material shape of the shape unfolded (2D) and lets you import contours onto it It then uses a POST to cut that into the pipe . Its easiest to be able to install a 5th rotary axis (A) and keep a flat table intact to do mixed cuts without a huge change over process.
If you wan to do mitres and join various diameters of pipe to other pipes at any angle or to a flat surface, you can look at PipeFit that actually
designs the joints using input boxes and displays in a 3D shaded drawing.
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Will it figure out bend radius's or pipe length to get compound bends to an exact length?....No . But it will "draw" a couture in 2D that cuts on a pipe to join (inside or outside) to a matching main pipe or plate