If you want a hole in the bookmark, add a negative part (cylinder) and adjust his size and position in the model. In the print project, the negative part is inserted.

Model size are 50x150mm or 65x200mm. You can only modify the X and Y dimensions. Do not adjust the height (Z) in your slicer! 

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm.

It is possible to print without AMS by manually changing the filament (setting filament change or pause) in the slicer, depending on your printer and sw support.

These were my settings and colors for my print that you see in the picture. Your results may be depending on the filament you use.

Filaments Used:
    PLA Elegoo+ Black Transmission Distance: 0.3
    PLA Bambulab Basic Brown Transmission Distance: 2
    PLA Elegoo + White Transmission Distance: 7
This print uses 3 unique filaments

Swap Instructions:
    Start with Black
    At layer #9 (0.8mm) swap to Brown
    At layer #11 (0.96mm) swap to White for the rest.