  Magnetic isotropic NdFeB powder is processed by the following additive
manufacturing methods: (i) stereolithography (SLA), (ii) fused filament
fabrication (FFF), and (iii) selective laser sintering (SLS). For the first
time, a stereolithography based method is used to 3D print hard magnetic
materials. FFF and SLA use a polymer matrix material as binder, SLS sinters the
powder directly. All methods use the same hard magnetic NdFeB powder material.
Complex magnets with small feature sizes in a superior surface quality can be
printed with SLA. The magnetic properties for the processed samples are
investigated and compared. SLA can print magnets with a remanence of 388 mT and
a coercivity of 0.923 T. A complex magnetic design for speed wheel sensing
applications is presented and printed with all methods.
