Fake Nokia Battery to hide Micro SD cards in.
It Hinges open to hide your Micro SD cards inside.
On Print as we speak.
Use 3mm filament for hinge.
I didn't tear drop the holes, so I might add a cut out on top and enlarge the hoels for easier assembly.
Acetone vapour bath, Print in Black, and add a label or label scan print from a real battery.
If you look on the original thing page I printed some out and painted the contact area with gold paint / ink to make it look more battery like.
A Nokia Battery Holder.
The Dummy of the battery: