radius gauge with minor tweaks

This is a slightly tweaked version of Grant Stevens’ original radius gauge.

Touch the tool's 3 disks to a curved surface, and read the radius on the dial.

I think the original idea and design were brilliant. That doesn’t mean that there wasn’t room for small improvements, i:

• used a nicer looking font, because, ugh.
• added the unit (cm only, no multiples of 0.9144 m/36)
• reduced the height the text protrudes.

For the STLs included i used a bolder version then for the printed one. Especially the “cm” should come out better than in the pictures.