vertical pen holder

clip the pens on the walls of this pen holder so they dangle straight down.

storing pens like this prevents the top cause of pens stop working: drying out after laying down for a long time.

attribution (Markdown text)

[vertical pen holder](https://www.printables.com/de/model/916785/) by [sosasees](https://sosasees.codeberg.page) is licensed under [Creative Commons Attribution 4.0](https://creativecommons.org/licenses/by/4.0/)

sizing

the walls are made of rectangles. each rectangle is 2 cm wide and 15 cm tall, a comfortable size to clip on any pen of usual size.

to store 12 pens, this pen holder has 12 such rectangles: 4 in the center, 8 outside