Ecopot

Simply press the bottleneck with cap on into the slot and it should pressure fit in. given your printers tolerances are near perfect, if not a little superglue helps too. Then cut the bottle in half, and fill the two pots you've just made with soil. I designed this around 20oz coke/pepsi bottles. I have not tested on liter sized bottles yet. Do not use PLA if you're using it outside.

The ear seen in the cover is a prop

I, like many like to recycle when I can. So I created this simple support stand to assist in turning the neck piece of a plastic bottle into a usable pot for my herb garden/garden. This was my solution to creating free pots from something I'd just throw into the bin otherwise.