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In this publication we describe the extrusion process and the properties ofpolymer-bonded anisotropic SrFe$_\text{12}$O$_\text{19}$ filaments for fusedfilament fabrication (FFF). Highly filled polyamide 12 filaments with a fillingfraction from 40 vol.% to 55 vol.% are mixed and extruded into filaments with adiameter of 1.75 mm. Such filaments are processable with a conventional FFF 3Dprinter. No modifications of the 3D printer are necessary. Detailed mechanicaland magnetic investigations of printed samples are performed and discussed. Inthe presence of an external alignment field, the Sr ferrite particles insidethe PA12 matrix can be aligned along an external magnetic field. The remanencecan be increased by 40 % by printing anisotropic structures. For the 55 vol.%filled filament, a remanence of 212.8 mT and a coercivity of 307.4 mT aremeasured. The capabilities of printing magnetic anisotropic structures in acomplex external field are presented with a Halbach-array arrangement. By theaim of an inverse field model, based on a finite element method, theorientation of the particles and the quality of the print can be estimated by anondestructive method.

Polymer-bonded anisotropic SrFe$_\text{12}$O$_\text{19}$ filaments for fused filament fabrication