Milk bottle plant irrigation adapter
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Use a PET milk bottle to keep your flowers watered while away or just reduce the frequency of watering at home.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Outdoor & Garden
- Licencja
- Creative Commons — Attribution — Share Alike
This is a screw cap I designed to convert old milk bottles into self-watering bottles for plants. Just screw it onto a milk bottle, fill it with water, and stick it into the soil — it releases water gradually, so you can go on vacation or reduce how often you need to water.
Dimensions
Outer diameter of the screw cap: ~41 mm. Total length: ~15 cm.

Side and bottom views. Dimensions are in mm.
Checking for fit - measure your milk bottle
Outside diameter: ~36 mm (without threads). Inside diameter: ~32.5 mm.
The source F3D file is attached if you know your way around Fusion — feel free to modify.
Print Settings
Optimized for 3D printing. Supports needed only on the inner seal ring — it's unsupported mid-air, so don't skip them.

Supports enabled on the green inner ring (seal) only.
I printed it on a Creality K2 SE in under 90 minutes, no brim needed. Printables doesn't have the K2 SE in their printer list, so I've selected the Ender 3 as the closest low-cost option — it should print fine on any entry-level printer. Let me know what worked for you!
Wanna say thanks?
You can buy me a coffee on Revolut (even if you do not use Revolut): revolut.me/klimacka