Imperial Scribe

This should work as a pencil scribe. Slide a wooden pencil through the hole, and accurately (or as accurate as your printer is calibrated) draw lines at 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" and 1", depending on the face used.

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/4vccZhzQutd