I just made this post on !hydroponics@slrpnk.net and thought it would also fit here :)

I made an adapter for standard glass bottles to grow lettuce and herbs in them hydroponically.

This print takes just a few minutes (designed for vase mode!) and you can use up your last inches of filament with it.

https://www.printables.com/model/1002248-hydroponic-kratky-bottle-adapter-vase-mode-ultrafa

I've been using these prints (not my design) on mason jars for a few years to grow various plands using the kratky method. My most successful plants have been basil, though I did have some bell peppers happily growing in these for a while.

Tbh, looks like lots of (wasted?) filament.

I have something similar. My 3" net cups fit perfectly into many used pickle jars.

You can coat them with acrylic color and/ or put some rope around.

They do use a good bit of filament, but I really like the look of them. I'm a bit of a sucker for geometric designs.