Nano SIM and Micro SD Holder Keychain
thingiverse
It has been really useful for me, this little key-chain can hold up to 4 microSD cards, or 6 nano SIM cards, or any combination of those, given that you can fit two microSD, or three nano sims per slot. And on top, there is a space for the tool to open you phone's tray. The whole build is: dX = 42mm dY = 23mm dZ = 6mm Pretty much as a flash thumb drive. The inner tray firmly clips into it's position, and the cover has a slot so you can push it from the back to get it out. Tolerances have been carefully designed to get a perfect fit, but the tray releases by it's own weight if you hold the clip back.
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