To secure ferromagnetic powder to the printing plane, the ideal field strength is uniform throughout the entire printing surface region.

A theoretical Helmholtz coil produces nearly 95% magnetic field strength uniformity within the chosen printing surface region.

A cross-sectional slice of the magnetic field in the center plane through each coil illuminates the change in field strength when traversing vertically and horizontally. The strongest field is found at the coils themselves, while the desired field is found at 0 [m] along the z-axis and between -0.01 [m] and 0.01 [m] along the x-axis.