The files for the STEMFIE shafts and corresponding connectors are now published and ready for download. You can find them in the Parts section under Connectors and Shafts.
STEMFIE connectors and shafts are ready for download
The free and never-ending 3D-printable educational construction-set toy you can download and make at home!
This toy is unsuitable for children under three years due to choking hazards! 
