Upcycle Jar Greenhouse, 3D Printed Self-Watering Planter

Design preview. Rendered from the file, not a photo.

The maker says it fits: glass mason jars. See the proof

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What it does

Transforms glass jars into mini greenhouses with built-in water reservoir
Hexagonal design allows honeycomb packing or mixing different jar sizes
Collects condensation to recirculate water back into the reservoir
Available in multiple sizes to fit common European jar openings
Perfect for starting seedlings or nurturing small plants indoors

This 3D printed self-watering planter cap transforms ordinary glass jars into functional mini greenhouses. Designed to upcycle common European jars, this innovative 3D print turns everyday containers into a sustainable home for your plants. The integrated water reservoir and condensation collection lip create a self-sustaining environment for seedlings and small plants.

The hexagonal design allows you to arrange multiple planters in an attractive honeycomb pattern or mix different jar sizes seamlessly. To find your size, simply measure the outer diameter of your jar opening. The system includes a built-in lip that collects condensation from the greenhouse environment and channels it back into the reservoir, reducing watering frequency.

When using with the glass jar lid in place, keep the water reservoir empty or at minimal levels (0.5 cm) to prevent oversaturation. The closed greenhouse environment retains moisture efficiently. Use the full reservoir capacity only when operating without the glass cover for optimal plant health.

22k downloads in the maker community. That is interest in the design on the site it came from, not our sales.

What it fits

The maker says it fits: glass mason jars

That is the maker's word, not a fit we measured. Check the size below against your own.

glass mason jarsFrom the maker's own listing title, checked 2026-08-13. See the original post

Brand names here only say what this part fits. We are not connected to those companies, and they did not make or check this part.

What you get

This design prints as one piece.
Nothing else to print or buy for this to work.

What it is made of

Designs like this print well in PLA. Compare the materials.

Printed plastic is strong for its size, but it is not metal. We have not load tested this design, so we do not publish a weight rating. Keep it out of a hot car and away from open flame.