Moleskine Notebook - Pen Holder

Update : New version here : https://www.thingiverse.com/thing:2670112

Pen holder for my Moleskine Notebook. Two diameter size: 11mm & 14mm
Thanks to Babozor who inspired this : http://www.thingiverse.com/babozor
I redesign it from scratch for a better hold (pen and clip). I'm using it every days at work, works fine for me. I'm looking for some improvments as a ruler holder...