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Glossary 146
a thick series of layers which can later be removed once the
print is finished. These layers — referred to as a raft —
are printed slowly so as to promote better adhesion to the
build plate as well as to level out the printing surface. A
raft usually has support material at its base, and a plat-
form (smooth surface) at its top, to support the object’s
base. When printing via the Polar Cloud, see the “
PRINT
SETTINGS
” under “
Raft Settings
”. 85 , See also slicer
retraction
In the context of 3D printing, retraction typically refers to
the amount by which the filament is retracted back into
the extruder nozzle to keep it from oozing out during non-
extrusion moves between sections of the print. That is,
during printing there are normally extrusion moves, dur-
ing which filament is being extruded, and non-extrusion
moves, during which the filament is retracted slightly back
up into the extruder nozzle while the extruder is moved
without extruding melted filament to some other portion of
the build plate where extrusion will be resumed. Retract-
ing the filament slightly up into the extruder nozzle for
non-extrusion moves helps keep filament from oozing out
while the extruder moves to a new position. When print-
ing via the Polar Cloud, see the “
PRINT SETTINGS
” under
“
Retraction
”. See extruder , filament & Z hop
SD card
An SD card is specific type of memory flash card and is
used to convey print files to your printer without using a
USB or network connection. SD cards come in a variety of