LulzBot TAZ 4, User Manual

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Advanced Usage
5.1 Intro
After you become familiar with printing using the default settings, a
few advanced techniques may help in getting better and more consistent
prints from the TAZ 3D printer. Some of these instructions are items
and materials not included with the TAZ. With any of these additional
items or materials, follow safety and usage guidelines as instructed by the
manufacturer.
5.2 Changing nozzles
The TAZ 3D printer ships with a standard 0.35mm nozzle which allows
small-layer resolution and up to 0.35mm layers. Although the 0.35mm
nozzle will be perfect for most printing applications, LulzBot also offers
smaller and larger nozzle sizes.
In most cases the nozzle is best changed when the hot end is slightly
warm. NEVER try to remove the nozzle when the hot end is at extrusion
temperature. At higher temperatures the threaded extension expands in
the nozzle causing the nozzle to bind if turned. Heat the hot end to
160°C .
This will soften the plastic inside the hot end and allow the nozzle to be
loosened off the threaded extension. Power off the printer and once it cools
continue unscrewing the nozzle. Take care when removing the nozzle while
the hot end is hot. Wear leather gloves or use a towel to turn the nozzle
off the hot end.
To change the nozzle you will need the included 13mm wrench and
needle nose pliers. Use the pliers to hold the rectangular aluminum heater
block away from the heater resistor and thermistor wires.
Using the 13mm wrench, turn the nozzle counter-clock-wise. Make sure
the nozzle is turning off of the threaded aluminum extension that runs up
through the heater block. Do not allow the heater block to turn. This can
put strain on, and possibly damage, the wiring.
Once you have removed the nozzle you can then thread on the other
nozzle size you would like to use. Make sure the nozzle has threaded
correctly onto the threaded extension before trying to turn it with the
wrench. Turn the nozzle clock-wise until it tightens against the heater
block.
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