This STEMFIE spanner is made of metal (brass) using the lost-PLA method. Like the lost-wax process, the original part was covered with plaster covering its surface except for a small sprue through which the molten metal flows. 

The flask containing the plaster-concealed parts was then heated in an oven to burn out the PLA, leaving a void. After that, molten metal was poured into the plaster mold to form the metal parts.

Finally, the plaster was washed away, revealing the resulting STEMFIE parts. These were cut, sawed away from the sprue tree, and then filed and brushed.

STEMFIE Spanner Brass Metal LostWax LostPLA v02

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.