Whey Container Kratky Hydroponics Lid
thingiverse
Lid that should fit on whey containers with 120mm ID lid Google Kratky non circulated hydroponics for usage details has not been tested with plants, whey container might be too short to let significant air roots to develop (might just need to counter this by having it filled to just barely touching roots at first) FreeCAD model file is included, that has an additional part that can be used to cut a mesh into the lid (reduces first layer time, but increases complexity) Wasn't able to get it to fit until printed at, at least 100.7% scale (101% probably would work too)
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