I got this ballpen from Autodesk just last January. Then I suddenly thought of why don’t I try modeling it in Autodesk Inventor. I began first with the main part and used the Revolve feature. Afterwhich, I entered in the assembly environment and continued doing the design there. You’ll notice that there’s a small green material which acts like some sort of grip. What I did is to use Rectangular Pattern first so that I’ll consider every column of that as one component. Then, in the assembly environment, I used pattern component so that I could place it around the pen. Then, I disabled the other occurrences since some of the columns reproduced are not necessary. This is rendered with Inventor Studio.