Several users have pointed out that the two basic types of fastening nuts in the STEMFIE standard; the cam-locking and the threaded nut, are too symilar seen from the outer shape. Therefore a new version of both nuts was made and are now available for download from the STEMFIE file repository, or by clicking here on the links below.
The difference between both markings is that the nut with the traversal line is threaded; the nut with the longitudinal line is of the cam-locking type.
Thanks to the community for testing STEMFIE and suggesting improvement! :-D