A loadcell is a component that converts force or weight into an electrical signal.
On our printers, it is part of the Nextruder, equipped on our Prusa CORE One, and Original Prusa XL, MK4/S, MK3.9/S. It detects if the nozzle is close enough to the steel sheet for printing.
A printer equipped with a loadcell has a first layer set automatically during the mesh bed leveling. This avoids any damage that would be caused by the nozzle digging into the steel sheet.
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