The STL file I am sharing creates an object bigger than my 3D Printer bed. Please be sure to scale it and orient it appropriately for your bed. Printed in PLA. The bed temperature was 70 C for the first layer with the fan turned off and 65C with the fan turned on for all other layers. The hot end was 220C for the entire print. (This will probably make more sense for PRUSA users.)

This is not the best possible design for racking a set of colored pencils, but I did find it a fun project and it is useful on my drawing table. Perhaps someone else will share an improved version.