Free

Fibonacci Spheres - Customizable Airless Balls

Hollow airless balls covered in evenly spaced holes, with the size, hole count and hole shape set in a form

Fibonacci Spheres - Customizable Airless Balls is a free browser tool on MakerWorld for fidget stress balls and math display spheres. Free; MakerWorld login needed to customize and download. Exports STL and 3MF. Last checked 26 September 2026.

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Opens makerworld.com

At a glance

Price: Free; MakerWorld login needed to customize and download
Runs on: MakerWorld
Exports: STL, 3MF
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Easy: a few settings to tune
Best for: Fidget stress balls and math display spheres
Selling prints: Not allowed Standard Digital File License: no selling of the file or of printed copies without the creator's permission.
How we checked: Read the tool page and docs Model page: FibonacciSphere.scad runs in the Parametric Model Maker, five example profiles from 40 to 100 mm, about 8,300 customizations
Last checked: 26 September 2026

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Sources: MakerWorld model page (description, example profiles and licence) (checked 26 September 2026)

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About this generator

Fibonacci Spheres is a free MakerWorld customizer by Brent Peterson that makes hollow, airless balls covered in evenly spaced holes. It runs an OpenSCAD script that places the holes on a Fibonacci lattice, a pattern that spreads any number of points evenly over a sphere, so the ball looks tidy whether it has 100 holes or more than 500.

In MakerWorld's Parametric Model Maker you set the ball's diameter, wall thickness and smoothness, then the number of holes, their width, how many sides each hole has and how they are rotated. Three sides gives triangles, six gives hexagons and higher numbers come close to round. The page has five example settings to start from: a 40 mm table tennis ball, a 42.67 mm golf ball, a 65 mm tennis ball, a thick 75 mm stress ball printed in TPU and a 100 mm display piece. The creator's profiles print the ball with supports underneath and explain how to use a second filament as an easy-release support layer.

It suits anyone who wants a squishy fidget ball, a toy ball for kids or a geometry model for a math class. It is free with a MakerWorld account.

What you can make

Airless balls with holes
TPU stress balls
Table tennis, golf and tennis ball sized spheres
Geometry display spheres

How to use Fibonacci Spheres - Customizable Airless Balls

Open the model page and click Customize
Set the ball diameter and wall thickness
Choose how many holes, their size and their number of sides
Generate, download the file and print it with supports under the ball

What you'll need to print it

Filament and parts that suit what you make with Fibonacci Spheres - Customizable Airless Balls.

TPU (flexible)

Bambu Lab TPU 95A HF (affiliate link) Amazon
Overture TPU 95A (affiliate link) Overture

PETG

Multicolor PLA

Also handy

Filament dryers and dry boxes

SUNLU FilaDryer S4 (affiliate link) Amazon
Polymaker PolyDryer (affiliate link) Amazon

Some of these are affiliate links: we may earn a small commission, at no extra cost to you. More about that

Fibonacci Spheres - Customizable Airless Balls pros

Hole count, size and shape all change from one form
Five example profiles, from a 40 mm table tennis ball to a 100 mm display piece, to start from
TPU stress ball profiles give a soft, squeezable ball

Fibonacci Spheres - Customizable Airless Balls cons

A round ball needs supports underneath, which leave some cleanup
Some settings, such as phiConstant and epsilonEnabled, are not explained on the page, so expect some trial and error
Needs a MakerWorld account, and the license does not allow selling prints