Panasonic FZ330 / FZ300 Battery Box

My first attempt at designing something that I could print and use myself.

The spare batteries for my camera always end up mowing around in the bottom of my camera bag so I decided I needed a box to keep the spares in so that when I needed a spare they would still be in the same place as I put them.

This box holds two batteries. My intention is to put the charged batteries in with the contacts facing the top and the used batteries in with the contacts at the bottom so that I know which are