Fake Nokia Battery to hide Micro SD cards in

thingiverse

This DIY battery case offers a concealed storage space for Micro SD cards within its hinged design. It can be 3D printed and used to store Micro SD cards securely. To create this clever card holder, you'll need a few basic supplies including 3mm filament and acetone vapor. First, design the holder on a 3D modeling software. Next, print it using black color and follow with post-processing to give it a battery-like appearance. For extra security, you can also apply gold paint or ink to contact areas to match an actual battery's aesthetic. If you're interested in customizing this card storage case further, there are some additional features that can be incorporated into the design such as adding labels for easy identification or making small holes larger to simplify assembly process.