apple logo bookmarks, simple as it gets, prints under 6 minutes on ender 3 v3 KE, uses under 3 grams of PLA (might be even faster on better printers) 

if printing more at once I recommend printing by object (instead of layer) since the model is very thin so collisions shouldn't occur and you can fit many of them on a bigger printer bed 

enjoy reading your next book with this companion 

check out my aperture bookmark, you can print it at once with these 2 apple logo themed ones during a single print, since they should fit well on most printer beds