Hex Ball

Bio Ball Turned Fidget Ball

This design started out as an aquarium bio ball meant to add surface area in a sump and act as a small refuge for copepods. Once printed, though, it turned out to be surprisingly satisfying as a desk fidget, so it’s taken on a second life outside the tank.

Print Details

• Normal version: 3 inches (76 mm) in diameter
• Scaled version: 75%, measuring 2.3 inches (58 mm)
• Printed in PLA  supports are required due to the open lattice structure

Why It Works Well in the Hand

The spherical lattice gives it a light, tactile feel with plenty of edges and openings to explore. The larger size fills the palm like a stress ball, while the smaller version is easy to roll or spin with one hand. The geometry also makes it visually appealing on a desk.

Original Purpose

In an aquarium sump, the structure provides high surface area for beneficial bacteria and small hiding spaces for pods. It still works for that role, but it also functions well as a simple, durable fidget object