Sodastream CO2 cartridge holder/rack

Whipped up a quick-and-dirty model to help store Sodastream CO2 cartridges on their side in my pantry.  I could only make the model so tall on my printer, so the bottles stick out a little bit, but even so it works like a charm.

If you're going to stack these (like shown in my photos) I recommend buying cheap adhesive rubber feet.