I wanted to add usb charging functionality to my car so the battery wouldn't drain when used navigation function on it and also I wanted to free up my 12v power port/cigarette lighter.
I decided the neatest solution was to replace one of the blank buttons that were in the console and fabricate a new one with a USB connector embedded. I used some polymorph to make a mold of the existing button and create the button with sugru molded around the connector.
Step 1: Material/Tools Required
1 Male - Female USB cable
1 USB car charger
1 Spline (star) drill bit Bit (to remove ash tray from Car)
Dremel type cutter