Pen & Sticky Note Magnet Shell
At the office, they want everything in the fridge labeled with your name and a date. I remixed this seashell to hold a popular-brand permanent marker and a popular brand 1.5" x 2" adhesive label pad, so that the tags are always handy.
To use the scad file, grab the original stl file from https://www.thingiverse.com/thing:2737054 and drop it in the same folder as my .scad file, then open the .scad file in openscad.