3.4. EXPERT MODE
extruders may need up to 4 or 5mm due to the hysteresis introduced
by the tube.
• Lift Z
- Raises the entire extruder on the Z axis by that many
millimeters during each travel. This can be useful to ensure the nozzle
will not catch on any already laid filament, however it is usually not
necessary and will slow the print speed. A value of 0.1mm is usually
sufficient.
• Speed
- The speed at which the extruder motor will pull back the
filament. The value should be set to as quick as the extruder can
handle without skipping steps, and it is worth experimenting with
this value to find the quickest retraction possible.
• Extra length on restart
- Adds an extra length of filament after
the retraction is compensated after the travel move. This setting
is rarely used, however should the print show signs of not having
enough material after travel moves then it may be useful to add a
small amount of additional material.
• Minimum travel after retraction
- Triggering a retraction after
very short moves is usually unnecessary as the amount of ooze is usually
insignificant and it slows down the print times. Set the number of
millimeters minimum distance the nozzle must move before considering
a retraction. If the printer handles ooze well this can be increased to
5 or 6mm.
• Retract on layer change
- Movement along the Z axis must also
be considered when dealing with oozing, otherwise blobs may occur.
It is recommended to leave this setting on.
Additionally there are several settings in the
Print
tab which can help
control oozing.
• Only retract when crossing perimeters
(Infill) - Tells Slic3r to
only retract if the nozzle will cross the threshold of the current island
being extruded. Slight ooze within the walls of a part are not seen
and can usually be accepted.
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