👉   Play freely and build endless fun at home with STEMFIE, the free 3D-printable educational toy   👈 

This simple STEMFIE project consists of only three 3D-printed parts and represents a spinning top, one of the oldest known toys. A fully-threaded BU2.5 screw serves as the vertical axis, while a BU3.0 washer maintains rotational inertia. Both components are secured in place by a 5 mm STEMFIE threaded nut.

Spinning the top on the screw's rounded head produces a random, wandering motion. To achieve a longer spin time, a sharpened piece of filament can be inserted into the screw's axial hole. For more dynamic motions, try spinning the top upside down.

Typically, this STEMFIE set can be printed in less than an hour, using approximately 2 meters of filament. 

Download the complete set of files here 

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SPS 000001 assembly step8 stemfie.org


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Quick-print sample

STEMFIE.org Quick print sample shoulder screw pin nut washers brace

The STEMFIE Quick-print Sample file is an easy way to test a few STEMFIE parts and fasteners. You can also check the STEMFIE Calibration File for more elaborate types of fasteners.



STEMFIE is a free, open-source, 3D-printable construction set toy that helps children learn STEM! Download the files freely, and please support my efforts to expand this project.