Prusa Research MMU3 Manual Del Usuario página 12

PASO 8 Consejo pro: introduciendo las tuercas
Some parts require you to use an Allen key at an angle to tighten a screw.
Even though the key is angled, make sure the screw is perfectly perpendicular to
the thread while tightening it. If it is hard to turn, release the screw fully, re-align it,
and start tightening it from the beginning to avoid cross-threading it!
For deep openings, use a long screw such as the M3x30 as a handle.
If a hex nut won't fit in: use a screw with a thread along its entire length (typically:
M3x10, M3x18) and screw it from the opposite side of the opening to drive the nut
in.
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1. Introducción
Ensamblaje Original Prusa MMU3