This disclosure relates to the field of additive manufacturing. 3D printers that rely on agent jetting
technology require a very precise distance between print head nozzles and the powder bed surface. A
large distance between the print head nozzles and the powder material can lead to drop trajectory
errors, sprayed drops, and other image quality errors layer by layer which will end up affecting final part
mechanical, dimensional and cosmetic properties. On the other hand, a small distance can cause print
head contamination or even interference between print heads and printed parts causing major defects
in the plot.
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INC, HP, "PPS FIELD MEASUREMENT", Technical Disclosure Commons, (July 23, 2018)