All geology photos need to have a scale. The model contains 1 cm square blocks inside a 1 mm wide frame. A circle with a 1 cm diameter is also included in the design. A keychain hole makes it easy to carry the scale. The front face of the model is flat and the back side has the area around the circle scale removed so that the scale can catch onto a small roughness on the surface of an outcrop and remain on the surface of the rock.

This scale model is designed to be printed on a dual extruder printer, using two of your favorite colors. Simply assign a different color to each of the two files, and merge them in your printing software before slicing.