Wall Dock for AA and AAA plastic storage boxes

I have a Maha battery charger near a wall in a desk and I wanted to sort the batteries in the wall, so I designed a dock to hold 20 AA or AAA batteries inside those cheap plastic cases from ebay (1 usd x4).

Cases: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=180748069477

Printed 4 to hold 80 batteries :)