Now with cap
Loosely based on the Fisher Pen made by Jmabry (http://www.thingiverse.com/thing:158722)
Simple print, great fit and comfortable in the hand. Blank area behind the pen makes a great spot for customization (see pics.)
Different enough to be unique and start a conversation.
No raft needed, may need support depending on your printer, but this printed just fine in my old FlashForge Creator.
Added Cap - I printed the cap at 5% fill and it printed fine. The clip is a little floppy but it works for me. I am sure it would be more rigid at a higher fill percentage. I built in a tab inside the cap to secure to the pen.