Power bank with USB output to charge cellphones etc.

thingiverse

Here are the instructions: First, you need to assemble all the parts of your power bank by snapping them into place with ease. Your 3D printed case is made from high-quality black PLA, although ABS will also work perfectly well. However, to make sure it's rock-solid for long-lasting performance, we recommend using a little bit of ABS cement or super glue to hold everything in place. By following these steps, you'll be able to transform your DIY power bank into an elegant, compact accessory.