Double Sided bic Pen

I wanted a small two sided pen and couldn't find any, so I just grabbed this pen body (https://www.thingiverse.com/thing:2928255) and modified it in tinkercad to make it double sided.
It works pretty well, you have to cut a small part off the pens ink tubes so they don't collide between each other, also the tips stays pretty firmly in place, maybe it's a little difficult to take them off.