Monitor mounted pen cup

Simple pen cup to hang on my monitor. My desk is very disorganized so why not put small, long things off the desk?

The bottom corners are rounded in hopes that it avoids dirt getting stuck in them but I couldn't decide on whether I wanted it split or not so I put an optional divider in there which required a notch to slide in, which can catch even more dirt. The plan was to decide when I see it in physical form but I've printed two of them already, and still undecided.

Only works if the top of your monitor is 10 mm thick