This is an oak tree bookmark that I designed and 3D printed. The roots can be inserted easily onto a page as shown above. "He will be like a tree firmly planted by streams of water, which yields its fruit in season and its leaf does not wither; and in whatever he does, he prospers." Psalms 1:4

The dimensions are 65 mm * 47 mm * 1 mm. I tested different heights: 0.8 mm, 1.0 mm, and 1.2 mm. The 1.0 mm height seemed to have the right durability compared to slimness. I printed it on my Ender 3 Pro at 2 mm layer height and 1.2 mm layer height, and the difference is not noticeable.