Fretboard Radius Gauge, 7.25" radius to 12" radius. Material: Blue Ender Series PLA

Settings:

15% Honeycomb InFill 0.2 Layer Height Perimeter - 3 Layers, Top and Bottom 3 Layers Temp: Hotend 210, Bed 65

In your slicer, make sure to paint the seam on one of the corners, otherwise it will create a seam in the middle of one of the radii.