⬢Turn the printer OFF and unplug the power cable from the PSU (Power Supply Unit).
Make sure the printer parts - print head and heatbed are cooled down at room temperature.
Before proceeding any further, it is recommended to protect the heatbed first!
⬢Take off the flexible steel sheet.
⬢Use any cloth or piece of fabric, which is thick enough and cover the heatbed. This will ensure you won't damage (scratch) the surface during the disassembly.
⬢Locate the corresponding opening on the bottom of the extruder heatsink and insert the hotend into the heatsink.
⬢At the same time, push the hotend cables behind the heatsink fan up towards the electronics.
⬢Push the hotend assembly all the way into the heatsink. There should be approximately a 2 mm gap between the heatsink and the brass part of the nozzle.
⬢While pushing the hotend assembly in, firmly tighten the lower thumb screw and the upper thumb screw.
Avoid pinching any cable between the screws and the heatsink!
⬢From the underside, check that the hotend is oriented correctly. It must fit between the cutouts in the X-carriage.
⬢Great job! You just successfully replaced the Hotend assembly on your Original Prusa MK4S.
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