Parametric Pen
by Thingiverse
No more losing your pens! This is parametric pen, which you can put a label on. Because who wouldn't want a pen with their name printed as the shape of the pen.
You should be able to size it to slip over a Bic pen, or to use as a barrel of a pen kit.
While this wasn't exactly derived from, it was certainly inspired by it. I built it in OpenSCAD, to make sizing and text generation easier.
Updated so that the pen's face is at z=0, making it easier to print.