Smooth Out 3D Text For 3D Printing

I am struggling to find out how to smooth out the arcs on 3D letters that I create in sketchup. When I print them they are really really choppy and I need to increase the number of segments but it will not let me. Any help is appreciated
Untitled.skp (26.5 KB)

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What plugin are you using?

He is using Curvizard, I prefer fredo spline. Both are paid plug-ins from Fredo