Stemfie

STEMFIE is an open-source construction set toy system^{[1][2][3][4][5][6][7]} and brand^[8][9], made out of 3D-printable plastic bricks, that are connected using screws. This construction set is designed with 3D printing and its limitations in mind. In contrast to Lego bricks, the CAD-files for the individual STEMFIE parts are available as open-source on GitHub and the STEMFIE website^[10], licensed under CC BY.^[9] Using the bricks, you can build projects, like a functional rubber-band car or a catapult.^[11] The STEMFIE construction set was created by Paulo Kiefe^[12] on 21 December 2019^[13], who is also the co-creator of the 3DBenchy.^[14][15] Paulo Kiefe presented STEMFIE at the Printed Worldconference 2025 in Amsterdam, Netherlands.^[14] All STEMFIE parts are designed in the open-source CAD software FreeCAD.^[16]