Printing with my Prusa I use several SD-cards to be able to print and plan ahead and prepare the next prints. To stay organized I was using paper stickers to my SD-cards at first. This tends to be very flimsy so I wanted a better solution.
I designed the labels fitting to standard SD-cards with the SD-card-reader of Prusa in mind, that let stick out only about 1/4 of the SD-cards.
The SD-card-labels are printed best standing what they are optimized for (the first tests were printed flat but then the SD-card could burst the layers apart, so I reworked the design for standing print).
Don't forget to activate brim, then you can add as many SD-card labels to your print job as you wish.
A little bit of deburring is needed in post-processing, but that's it.
To write on the labels, I attach a strap of clear Scotch tape on them and use a removable overhead marker. If the Scotch tape gets too worn out, just replace it. :)