Extended Data Fig. 5: Magnetic moment densities of printed samples with different NdFeB particle volume fractions.

For printed specimens at each volume fraction, a permanent magnet is used to generate external fields (50 mT at the nozzle tip). The magnetization values of printed samples (red) are compared with the maximum achievable magnetization values (black) measured from uniformly magnetized samples. The uniformly magnetized samples are printed in the absence of external fields, cured, and then magnetized under impulsive fields (about 2.7 T). Printing under the applied field of 50 mT yields a magnetic moment density that corresponds to 63%–64% of the maximum achievable magnetization at each volume fraction of NdFeB particles.