I wanted a pen cap to protect my HP Envy x360's pen that came with it, so I made this. Depending on if you have one similar to mine, it might be loose or tight but I modeled this off of my pen. It also has a bottom engraving. The HP engraving was made to match the one on the pen.

This model is a remix of this, I adjusted this for my needs, and added an engraving on the bottom.