Pen holder for Rocketbook or similar notebook

thingiverse

I prefer to keep my Frixon pens neatly stored with my notebook because they tend to disappear if I don't keep them together. To prevent them from getting misplaced, I use a standard hole puncher and make just one small hole in the pen clip, securing it firmly in place. The pen clip snaps shut over this single hole, providing sufficient hold already, but adding a tiny drop of glue takes it to an even more secure level.