I needed a post-it holder and none of the ones I found online worked for me so I designed and printed my own. The goal was to not use too much filament and hold 6 stacks of notes.

Printed on my Prusa MK3S at 0.3mm layer height in prusa galaxy black.

edit: Post-it-holder-large is for 8.5x8.5cm post its, the regular one fits post-its that are 7.5x7.5cm.