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

The STEMFIE Desktop Catapult is perfect for shooting ping-pong balls or crumpled paper. The ball-holding beam moves using the energy stored by two rotor springs. To arm this catapult, you rotate the beam until it locks into place held by the trigger. You can shoot ping-pong balls into cups or hit and flip the STEMFIE shooting target, which this project includes.

Download the complete set of files here


 

SPS 000001 assembly step0 stemfie.org parts list

Click for a larger image.

SPS 000001 assembly step0 stemfie.org build plates

SPS 000001 assembly step0 stemfie.org tools

SPS 000001 assembly step1 stemfie.org

SPS 000001 assembly step2 stemfie.org

SPS 000001 assembly step3 stemfie.org

SPS 000001 assembly step4 stemfie.org

SPS 000001 assembly step5 stemfie.org

SPS 000001 assembly step6 stemfie.org

SPS 000001 assembly step7 stemfie.org

SPS 000001 assembly step8 stemfie.org

SPS 000001 assembly step8 stemfie.org

SPS 000001 assembly step8 stemfie.org


Gallery

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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.

Browse parts

2023 12 06 STEMFIE online viewer

Check out the STEMFIE web app prototype to browse, view, and download parts (Github).