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c) Inspection of the fan sheet and the actuation for the Z-limit switch
The two extruders should be in the home position. This means that they both need to touch the extruder holder on top.
The fan sheet height must be set so that the two upper screws of the two rear fans do not tough the X-plate (left figure). At the same time, the
fan sheet must be above the two tips of the extruder nozzles (right figure). Of course, it should also be as straight as possible in reference
to the extruder nozzles.
Additional, you need to observe that the fan sheet must not touch the
attachment screws of the temperature sensors of the two extruders.
Also make sure to check the actuation for the Z-limit switch.
This must be aligned so that the square is aligned in parallel with the
light barrier and can move into it cleanly. Also check that the hexagon
threaded bolt and the counter nut of the actuation are tightened and
that the entire unit or the actuation cannot be adjusted.