Solar Power 2: A Simple Box

Here's the CAD file (made using Solidworks- an expensive but much more professional, intuitive, and powerful program than most free CAD programs).

The design is pretty simple; a box held together by captured nuts and M3 screws. The two end pieces are

made from 1/4" acrylic in order to hold the captured nuts, but the rest is 1/8". The inner dimensions are roughly based on the size of an Altoids tin to make sure everything will fit. I'll press fit the solar logo and the USB part of the letters in a different color, and the rest will be rastered/etched into the material.

There are two inputs: the DC plug for the solar panel (the plug makes it easy to leave the clunky panel at home) and a mini-usb port for wall charging (for when an external battery is needed, but there's not enough time to use the panel). The main circuit inside boosts the voltage from around 3.3V (from the battery) to 5V for the USB output.