Field Notes Pen Clip

This is inspired by this thing:
http://www.thingiverse.com/thing:3560

I didn't like the extra width that was added so I made a new one with the pen holder on ton instead.
I've added a version for for Fisher bullet space pen, it has a slot for the pen clip to hold it much better.

Update:
The clip was a little tight so I adjusted the width between the clips and it will fit much better now