3D-Printed Soft Magnetic Cores For Compact Electromechanical Devices Via Material Extrusion

This paper reports the fabrication and characterization of 3D-printed, soft magnetic cores manufactured via material extrusion that attain a relative magnetic permeability above 30. The cores are monolithically fabricated from pellets of nylon-12 doped with FeSiAl particles and do not require heat postprocessing, which makes them compatible with polymer-based, multi-material fabrication. The proposed cores exhibit a very low magnetic retentivity and negligible electrical conductivity, and they outperform the cores of similar characteristics found in the literature by an order of magnitude. This work is of great interest for the inexpensive, single-step fabrication of monolithic electromechanical devices.