From the war on where to put your opening parenthesis to pointing the (git) blame on others, here are some fun signs that will make you or the developer in your life smile.

Printing and Assembly

Let the print cool completely before removing from the bed to avoid warping while it's still warm.

The inner piece has a single color change after 1mm.  Printing all in one color and going over the text with a permanent marker works too.

The inner piece simply clicks into the frame on the four sides.

The frame can be hung with a nail, screw, or mounting tape.  It can also stand itself up on a flat surface.