Summary

A simple & practical protractor & compass providing a full 360° of use.  Useful for measuring or drawing circles, arcs & lengths in ½ centimeter increments.  It's size & ruggedness makes it Ideal for woodworking or metal work.  The bottom & top parts just snap together and the Vernier dial provides a ½° measurement accuracy.  It measures approximately 300mm in length when both arms are fully extended.

To use as a compass, secure it from the center hole (at the bullseye) with a small nail or pin, then determine which size circle you want by placing a pencil in one of the holes located along one of the ruler edges.  Mark your object by rotating the pencil around the center to create a circle or a specific arc. 

Printing

The top & bottom parts have deboss (engraved) text.  For those who prefer printing the text in a different color, separate parts are also provided.  The debossed prototype shown in the photos was printed in ABS using a 0.6mm HF nozzle, with a 0.2mm layer height & 20% infill.  The filament color was changed at a specific layer height to highlight the text.  You may achieve higher detail on the text if you use a 0.4mm nozzle & print the text separately overtop the main debossed parts.