Prusa Research MMU3 Manual Del Usuario página 146

PASO 3 Loading a filament through the buffer
Insert the tip of the filament 1 into the bottom PTFE tube attached to the
spoolholder.
Keep pushing the filament into the PTFE tube until it appears in the corresponding
buffer cassette.
Take the tip and insert it through the cassette into the other PTFE tube, which goes
into the MMU unit.
PASO 4 Preloading filaments to MMU
On the printer, go to the Menu -> Preload to MMU
Select Filament 1. The MMU unit will engage the idler into the first position and
start rotating the pulley until the filament is loaded in.
Keep pushing the corresponding filament end into the PTFE tube from the buffer
into the MMU, until you feel the filament being pulled in.
Remember, the filament tip must be straight and sharp in order to load it properly.
Repeat the same process until you load all five filaments.
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11. Primer comienzo
Ensamblaje Original Prusa MMU3