Rollerball pen

I came across a few fountain pen designs on Thingiverse, but no rollerball pens. So, I decided to buy a rollerball refill and design a pen around it. The refill I used was a Parker Quink refill. It says 0.7 and 9k0 on the casing. I have included pictures of the refill for clarity.

I designed this in Fusion 360, and have included the .f3d file incase anyone wants to use it.

I have added an image of the packaging for the refill.