Some time ago, I changed the external shape of the threaded and cam-locking STEMFIE nuts to make them straightforward to differentiate. After gathering more experience and feedback from the STEMFIE community, I made the threaded nut smoother. This makes it clearer to see the difference between them when looking at a pile of both kinds of nuts. In other words, the threaded nut is smooth, and the cam-locking still has its longitudinal slot.

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.

Support

STEMFIE.org DOWNLOAD Parts

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.