I created these with Tinker Cad, you can use these to transfer your Gardyn Y-cubes to jars to use with the Kratky style of hydroponics. Kratky is a method of simply adding nutrient solution to the bottom of the netcup (or in our case the Y-cube) and letting the plant grow. You do want to either wrap or paint the jar to avoid light getting into the nutrient.
Printing on these is quite simple, just put the narrow ring side up and print without supports. If you plan to place this out in the sun, I would recommend PETG. Super easy and fast print, taking very little filament.
The author hasn't provided the model origin yet.