WATER FILTERS
Jem: a flower-opening tap filter for activated carbon
The top opens for filling, the lower grid keeps the media in place, and continuous print paths reduce micro-stringing in the water route.
Jem
A polypropylene tap water filter for activated carbon. The flower-like top opens for filling, the body attaches to standard taps, and the bottom grid holds carbon while water passes through. Joined G-code keeps the water path cleaner by reducing micro-stringing.
Activated carbonA bottom grid keeps the carbon inside while allowing water to flow through the filter body.
Clean toolpathJoined Cura G-code sections keep the pattern continuous and avoid retractions that can create stringing.
MaterialJem is designed for polypropylene: food-safe, chemically resistant and stable in water.
Related guides
SLICING GUIDE
How to slice Jem
Jem uses polypropylene, a tap-mounted water path and joined G-code sections so the print can stay watertight and clean with very different geometry in one object.
POLYPROPYLENE
Why River uses polypropylene for bottles, Jem and Yuki ice packs
Polypropylene is slow and demanding to print, but it can make watertight one-wall parts, living hinges and food-contact objects when the workflow is controlled.
Similar designs
Jusy
A handheld PCTG water filter used beside the tap: remove the protective cap, hold the body under running water with one hand, and fill a glass below with the other. Food-safe, chemically resistant and practical.
Also from River Family
Air purifiers
Roy
A quiet, USB-powered air purifier that just does its job. Cleaner room air from a printed object that actually looks like it belongs on the shelf — no humming appliance, no exposed electronics.
Ice air coolers
Yuki
A full-size ice-pack air cooler built from printed parts, a quiet USB fan and a frozen water pack. Freeze the pack overnight, place it inside, and Yuki sends a steady cooler stream across the desk with very low power use.