Crayola markers holder
This is a Crayola markers organizer. It holds 16 small markers.
You can tweek the openscad file to make it fit larger markers (or more or fewer) if you need.
The openscad file depends on the regular polygon library from VincentD : https://www.thingiverse.com/thing:335968 just put the Polygon.scad file in the same folder and it should compile.