When the manufacturer puts together your 3D printer, it programs the extruder to make a certain number of “E-steps” in order to extrude a given length of filament. In short, E-steps are the incremental movements made by the extruder stepper motor as it rotates, and this rotation translates to linear movement of the extruded filament. One essential part of 3D printer calibration is setting the number of E-steps per millimeter on the extruder. Sometimes, however, the components of the machine need calibrating so the physical hardware is in sync with the digital instructions being sent to it. On the whole, FDM 3D printers are smart pieces of equipment that are capable of doing almost exactly what you tell them to.
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