Pencil Launch Silos

Is your listless collection of pens and pencils moldering away in an old, chipped "World's Greatest Dad" mug? Liven up your scribe-ware with a ballistic array of pen/pencil launch tubes! Just flick the little thwacker at the bottom of the tube, and your favorite writing implement presents itself, mid-aid, ready to grab and write. Don't believe me, just watch:Print as many as you like - they interconnect with dovetail slots in the back. I've also provided two different heights: full-stealth, wher