This is a fascinating kinetic object based on dodecahedron geometry that assembles into a smooth, spherical structure. When interacted with, the model gently expands and contracts, creating a calming and mesmerizing motion.

The sphere feels great in the hands and works perfectly as a desk toy, stress reliever, educational geometry model, or simply a beautiful mechanical object to display.

All parts are carefully designed and optimized for 3D printing without supports or brim, ensuring an easy and reliable printing experience.

Required Parts

To assemble one complete sphere, print the following:

60 × Brackets

20 × 3‑way connectors

12 × 5‑way connectors

Recommended Print Settings

Supports: Not required

Brim: Not required

Layer height: 0.2 mm

Infill: 15–20%

Material: PLA (PETG also works well)

🔧 Assembly Instructions

Step 1 — Lock the Brackets

Each bracket consists of upper and lower parts with a built‑in snap‑lock mechanism.

Align the upper and lower parts

Firmly press them together until they click into place

🔒 No glue required.

💡 Tip: Before assembly, make sure all parts are clean and free of stringing or burrs to achieve the smoothest possible motion.

Step 2 — Build the Modules

Connect the brackets using the 3‑way connectors

Form flexible triangular segments

Ensure all joints remain movable and do not bind

Step 3 — Assemble the Dodecahedron Frame

Join the modules together using the 5‑way connectors

Gradually form the full spatial structure

Regularly test symmetry and smooth expansion/contraction

Step 4 — Final Check

After installing the last connectors, gently compress and expand the sphere

Movement should be smooth and even in all directions

Kinetic Dodecahedron Sphere — Expandable Geometry Toy

0.2mm layer, 2 walls, 15% infill