User's Manual Part 2

Glossary 281
has two extruders, then the right extruder is “tool 0” and
the left extruder is “tool 1 ”. To further confuse matters,
in Gco de motion commands for the right extruder may use
the prefix “A” while the left extruder the prefix “B”. See
also extruder & Gcode
under-extrusion
When t he extruder outputs a deficit of plastic, under-extrusion
results. 241, See also over-extrusion
Zrod
On a Polar3D printer, the Z rod or Z threaded rod is the
tall, threaded rod towards the back of the printer on which
the print head (the printer extruder assembly) moves up
and down; see Figure B.1. 4, 182, 231, 236, 246, See also
extruder & print head