*Note: Added new top 10/18/2015 with hole to view 5V LED. This is the primary picture. Removed original top design.
This enclosure is for the DROK DC-DC Buck Voltage Converter 4.5-40V 12V to 5V/2A Step-down Volt Transformer Stabilizer Voltage Regulator Module Power Supply Switch Inverter Board with LED Voltmeter 5V USB Charger. This can be purchased online through places like Amazon.com. http://www.amazon.com/gp/product/B00IWOPS8K
The cheap device allows you to use a variable input voltage from a range of sources. For example a solar panel or a car battery and convert it down to a stable 5V output supplied to a standard USB connection for phone charging. I thought it would be good to design an enclosure which would stop the possibility of shorting the circuit if it was installed in the car, and also to make the power cable have some form of stress relief mechanism.
There are 4 files (in no particular order):
1) Bottom Enclosure without mounting tabs
2) Bottom Enclosure with screw hole mounting tabs
3) Top cover with simple buttons for main power on/off (LP) and 5v on/off (ON) + LED hole (so you know when the USB output is powered).
4) Top cover with no holes for always on mode (circuit needs minor modification for this mode)
When printing this with PLA I've had no issues using a push fit to get the top attached. Note that the printed pins use the fatter diameter section on the inside of the enclosure to stop them from falling out. I ran a craft knife around the outside of the holes before installing then to make sure there was enough freedom of movement. Make sure the buttons click on and off easily if you intend to glue the top on.
Just to go over the buttons. The top one is marked LP. This option turns the unit and voltage display off completely. The bottom button is marked ON and turns the 5V output circuit on. When the 5V circuit is on a surface mount LED is lit. This LED is visible through a small extra hole marked USB. You can cut some traces on the circuit board to disable these buttons and there is more information on Amazon.
Printed on my Monoprice 3D printer with black PLA at 220 degrees. Glass build plate set at 40 degrees. Using hairspray to aid adhesion.