It is just a very simple and thin bookmark. Most bookmarks i´ve seen are overcomplicated and will probably crinkle or even tear the paper.

I printed it in PETG for better durability, especially because it is just two layers but PLA works fine too.

I made one profile with a Hilbert Curve top surface pattern which looks pretty good in my opinion. If you don´t like that, there is a normal profile for you too.