Analysis of angles for 3D printing

I’m trying to color the geometry depending on the degree of the surface. (Alpha)
Everything under 50 degrees should be displayed red because the 3D-Printer is not able to print without support structure.
But everytime I try to add R and P in the right trigenometry panel, Grasshopper crashes.

Thanks in advance! (13.9 KB)

I’m so stupid - there is no right angle :sweat_smile: (11.7 KB)

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Thanks for your quick solution!