  Within this work, we demonstrate in-situ easy-axis alignment of
single-crystal magnetic particles inside a polymer matrix using fused filament
fabrication. Two different magnetic materials are investigated: (i) Strontium
hexaferrite inside a PA6 matrix, fill grade: 49 vol% and (ii) Samarium iron
nitride inside a PA12 matrix, fill grade: 44 vol%. In the presence of the
external alignment field, the strontium hexaferrite particles inside the PA6
matrix can be well aligned with a ratio of remanent magnetization to saturation
magnetization of 0.7. No significant alignment for samarium iron nitride could
be achieved. The results show the feasibility to fabricate magnets with
arbitrary and locally defined easy axis using fused filament fabrication since
the permanent magnets used for the alignment (or alternatively an
electromagnet) can be mounted on a rotatable platform.
