Prusa Research MMU3 Manual Del Usuario página 82

PASO 5 Rods and bearings assembly
Attach a bearing onto each end of both rods.
Attach the plugs onto the rod ends to fix the bearings on each rod.
PASO 6 Finishing up the Spoolholders (vac. form.)
Attach the rods with bearings into the base part so that the bearings engage into
the corresponding grooves on the base.
There is a notch on the front part of the spoolholder.
Attach the PTFE holder onto the notched front part of the spoolholder.
Repeat the same steps to build the remaining spool holders until you finish all five.
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8. Montaje Porta bobinas
Ensamblaje Original Prusa MMU3