This is bookmark that I modelled after the game Tens! (https://tensga.me) that we created at Kwalee.
After I printed a few harry potter bookmarks and distributed them around the office I noticed that a lot of people where using them, so I decided to model a bookmark after our game, the dice theme looked nice and I had the right colour filament (bought to make prints for my nieces).
I'm releasing the STL and the Source file in openscad.
Using the openscad file you can change one variable to get any dice number from 1 to 6 or you can remove the dice altogether and add your own bookmark head.
Printed mine multi-colour using the prusa's color print (changes filament after a certain layer height). the base part is 0.4mm so printing with 0.2mm layers the color print change layer should be set to 0.6mm (this always gets me).
The dice head is 1mm thick so the whole thing is only 5 layers tall using 0.2mm.
Filling up my Prusa Mk2s I can print 21 at the time in 1hr44ms (with the colour change).
0.2mm print, colour change at 0.6mm.
Couldn't be easier to print, I have done 4 batches of 21 bookmarks each so far.
Source code is available, the bookmark base is separated from the dice head so you can put your own bookmark head and just create your own.