Retraction
covers how the slicer
“retracts” the filament during travel operations
where it's not actually laying down plastic.
Good retraction settings help keep your part
free of little strings and blobs during printing.
Length on Move
specifies how much
filament will be backed out of the hot end
during a non-printing move.
Length on Tool Change
is specific to
multi-extruder systems. If the slicer is
changing to a new extruder, it will retract the
material out of the current hot end by this
much. This works in conjunction with wipe
towers and wipe shields.
Speed
dictates how fast the extruder
drive will pull the filament out of the hot end.
Higher speeds can assist in preventing
already-melted plastic from oozing or leaving
strings on the part being printed. It also controls how fast the filament will be returned to the hot
end when the non-printing move has completed.
Z-Lift
is used to lift the nozzle off of the part as each retract finishes. This can help
prevent blobbing.
Minimum Travel Requiring Retraction
is used to prevent retractions during very short
moves when retraction isn't really necessary. When executing a non-printing move, the nozzle
will have to travel at least this distance in order to trigger a retraction action.
Minimum Extrusion Requiring Retraction
specifies how much filament must be
extruded before a retraction operation is permitted. This helps prevent instances where a
retraction operation would occur before the hot end had the opportunity to actually extrude
material.
Retract When Changing Islands
if checked, will trigger a retraction when the nozzle is
traveling to a different “island” on the current layer. (An “island” is any place on the current layer
that has an air gap between it and another “island”.)
Wipe After Retract
is used to “wipe off” the nozzle by retracing up to 10mm worth of
travel before continuing on. This can help with stringing issues.
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