I made this specifically to hold a set of 22 PaperMate Inkjoy pens, but it can hold other pens and pencils as well!  I've found that these pens need to be stored vertically, otherwise after use the ink cartridge can tend to get bubbles in it which lowers the lifespan of the pens.

Only uses about 50 grams of filament and is pretty no frills! :)