The wearable battery pack for Google Glass! Learn more and buy one at https://www.tindie.com/products/VoidstarLab/voidstar-tactical-cell-the-wearable-battery/ .
I recommend orienting the print with the USB clip facing upwards. Printing it bottom-side-down will weaken the belt clip.
The Tactical Cells I ship to buyers are printed with 0.20mm layer height, 20% infill, 2 shells, supports, no rafts, filament fan on, with PLA on blue tape soaked with denatured alcohol.
To complete the build, slot in a commonly-available 2600mAh PowerBank and add a retractable micro-USB cable.
These files are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
You are made free to hack the Tactical Cell, make custom versions, and print some for yourself. You aren't allowed to sell clones, release files without mentioning Zack Freedman and Voidstar Lab, or release your project under a more restrictive license. I'll prosecute. Let's keep open hardware fair, profitable, and friendly.