Prusa Research MMU3 Manual Del Usuario página 72

PASO 7 Assembly (part 4)
Insert three M3x30 screws into the marked openings on the side of both the
Segmenter and the Printer holder. Tighten them up.
If the screw doesn't go in, make sure all the holes align with the plates.
Do not overtighten the screw. Otherwise, the buffer plates might deform.
Attach another two M3x30 screws into the openings on the other side of the
Segmenter.
PASO 8 Assembly (part 5)
Insert the last M3x30 screw into the marked opening in the Printer-holder.
Note that some versions of the part may have the opening on the opposite side,
but the assembly process remains the same.
Do not overtighten the screw. Otherwise, the buffer plates might deform.
Push the screw into the assembly until it reaches the nut. Tighten it up.
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7. Montaje del Casete del buffer
Ensamblaje Original Prusa MMU3