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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