I needed a holder for SD cards that I could toss into my bag that would then keep them safe as I ride around on my bike. The starting point for my design was one that I found in the Tinkercad Gallery, but I was not convinced that the spaces for the cards were correct, but I had no reference to compare with.

A few google searches gave me the dimensions of the different sizes, but also turned up information about the other types of memory cards. At that point I expanded the design to provide a reference for all the types of storage card that I have. I only needed spacers for the SD standard and micro sizes so those are the only two I made spacer blanks for.

The idea is that one makes components from the spacers to be imported into designs that need them

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/7NN5eS25VJV