This is a marker holder designed specifically for Expo Markers. It can mount to a whiteboard or a wall using a single command strip. This takes around 2.5 hours to print (using my settings) and it is compact, easy to use, and you can easily mount multiple of them next to each other.
I used a glass print bed at 60 degrees Celsius and a glue stick to aid in adhesion to the build plate.
Depending on your print speed and fan speed, the arch that holds the marker in can sometimes come out rough. To clean this up I used 120 grit sandpaper.