Prusa Research MMU3 Manual Del Usuario página 96

PASO 15 Extruder reassembly (Part 1)
Re-insert the hotend back into the extruder. Ensure its orientation is the same as
seen in the picture.
IT IS CRUCIAL to ensure the hotend is fitted properly in the extruder-body!!! The
top of the hotend must fit into the correct recesses in the printed parts. See the
second and the third picture for a reference!
PASO 16 Extruder reassembly (Part 2)
Check once again the correct position of the hotend. Look from below the
extruder. The heater block should be oriented as seen in the picture. Perpendicular
to the printed parts, with the cables pointing to the back.
Guide the thermistor cables above the thick heater cables.
Take a look from the side of the extruder. The nozzle should be slightly below the
printed fan-shroud.
If it is significantly lower than in the picture, your hotend isn't inserted correctly.
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9B. Mod extrusor MK3S+ (KIT)
Ensamblaje Original Prusa MMU3