FreeHydroponic NetCup Mason Jar Adapter
Thingiverse
11 model
Free
Freemhpgardener-netcup
Thingiverse
FreeMod for 2" 50 mm Netcups so they don't fall through the holes.
Thingiverse
Free2in Net Cup Cover
MyMiniFactory
Free2-Inch Hydroponic Net Cup for 1.5" Rockwool Cubes (NC2-15)
Printables
Free6pod 2inch net cup hydroponic modular tower by rosetta-wang / garden plant module
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FreeAdapter for net cup, kratky mason jar
Printables
FreeHydroponic Hex Net Cup
Printables
FreeNet cup for aquaponics to fit 75mm polypipe
MyMiniFactory
FreeHydro-Wiz 2in Net cup fix 4in pvc
Thingiverse
Free2 inch net cup holder for wide-mouth canning jars
MyMiniFactory