These A-Z labels can easily slide onto standard 19.5mm bookshelves to organize media. Also included is "Biography", "Science", "Cooking", "History" and "Mythology".
Ideally, this is printed at 0.15mm layer height with color change after 3rd layer (h=0.5mm) but can be adapted to larger layer thicknesses. PLA works fine as long as the clip angle is kept near 90°. PETG is better for wider clips and for more flexibility.
The author hasn't provided the model origin yet.