Gravity Filter Bottle Cap 3D-Printed Kitchen Accessory

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

The maker says it fits: Camelbak Crux or 5/16" ID tubing gravity filter systems. See the proof

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What it does

Lets air escape as your bottle fills so water flows without getting stuck.
Stem stays fixed while cap twists, so you can remove the cap without disturbing your filter setup.
Works with Camelbak Crux or 5/16 inch ID tubing, so you can use it with most gravity water filters.
Made in the USA from a custom design, so you get a part built for your exact filter system.

You get a working bottle cap that plays nice with gravity water filters. This cap lets air in as water fills your bottle, so you skip the air lock problem. The stem does not attach to the cap, which means the stem stays put while you twist the cap on and off.

The design works with larger Camelbak Crux bottles or any 5/16 inch ID tubing setup. Air can move freely, so your filter stays efficient and your bottle fills smooth. Print it upside down with supports so the two pieces stay separate during printing and work right when done.

2.6k 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: Camelbak Crux or 5/16" ID tubing gravity filter systems

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

Camelbak Crux or 5/16" ID tubing gravity filter systems (model or 5)From the maker's own listing notes, checked 2026-08-13. See the original post

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 We have not load tested this design, so we do not publish a weight rating.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.