PET Bottle Hydroponics Kit — Net Pot + Snap Caps for 28 mm & 38 mm Bottles (Kratky)
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Turn any plastic drink bottle into a self-contained hydroponic planter. One universal net pot + two push-on caps that fi
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- Printables
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- Outdoor & Garden
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- Creative Commons — Attribution — Noncommercial — NoDerivatives
Grow fresh herbs on your windowsill from bottles you'd otherwise recycle.
This set turns an ordinary PET drink bottle into a passive hydroponic planter using the Kratky method — you fill the bottle with nutrient solution, drop in the net pot with a seedling, and the roots grow down into the water. No pumps, no power, almost zero maintenance.
It was designed around real, measured bottle necks so the parts actually fit — not a generic model that's "close enough."
What's included (3 STL files)
Net pot / basket — universal, slim Ø19.5 mm body that drops through both neck sizes. Holds a standard 16 mm grow plug / sponge holder on an internal seat (it won't fall through), with a Ø13 mm root channel and 6 side windows so roots reach the water and get oxygen.
Cap — 28 mm neck — fits the most common PET bottles (water & soda, PCO‑1881 standard, e.g. Mattoni Essence and similar). Push‑on fit.
Cap — 38 mm neck — fits wide‑mouth bottles (iced tea / juice, e.g. Nestea and similar).
The net pot sits in the cap; the cap pushes onto the bottle. Same net pot works with either cap.
Why you'll like it
♻ Upcycles bottles you already have — basically free planters
🔌 No electricity / no pump — true passive hydroponics
🌱 Great for basil, lettuce, mint, parsley, cilantro and other leafy herbs
🧩 Two neck sizes covered with one shared net pot
🖨 Fast, small prints — no supports
What you'll need (not included)
A clean PET bottle (28 mm or 38 mm neck)
A 16 mm net/grow plug holder + rockwool or sponge (or just sponge)
Hydroponic nutrient solution + seeds
PRINT SETTINGS
Material: PETG recommended (durable, holds up to constant moisture). PLA is fine for trying it out.
Layer height: 0.20 mm (0.16 mm for a cleaner net pot)
Walls / perimeters: 3
Infill: 15–20 %
Supports: None — the net‑pot windows and caps print support‑free
Orientation: Net pot flange up; caps with the open skirt down on the plate
Print time: ~15–35 min per part
Fit tip: the caps are a push‑fit. If your bottle's neck is slightly different, scale the cap by 1–2 % or sand the inside. Bottle necks vary a little between brands — measure your neck's outer thread diameter with calipers if unsure (≈28 mm or ≈38 mm).