UPDATE: .f3d file has been uploaded and modified. After some intense use for over a year, The grip isn't holding the pen perfectly. So, I modified the grip holding technique. I did not print a new one, but it should work better. If any problem arises, I would reprint at 98% scale.

The f3d file has V1 (intial verison) and V2 with the untested new grip pattern.

I needed some type of holder for my pen. It was very slippery and thin, and I was afraid to lose my 110 euro pen. Therefore I took it to Fusion 360 and created a nice futuristic design that holds my pen. The structure has been made to look modern, but also strong. Due to the size being larger, it will stay in your pouch, bag, side pocket, or where ever you put this holder. It has been refined to hold the pen via a simple push with tension, but might get loose. Feel free to edit it further if the design doesnt work for you. I have used it for a month now; no problem :)