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19
Care & Maintenance
Cleaning the Nozzle
Use extreme caution when maintaining or operating
heated machinery. The nozzle must be heated to 180ºC
(minimum) when cleaning.
When to clean the nozzle:
• When filament is not flowing smoothly
• When filament is not being extruded appropriately
• When changing material type
• Periodically between large prints—preventative
maintenance
How to clean the nozzle:
• Cold-pull method:
– With filament in the hot end, heat nozzle to
printing temperature according to the filament
– Cool nozzle to 90ºC
– Immediately after 90ºC temperature is reached,
press button on side of extruder, quickly pull
filament from extruder
– Examine end of filament that was in extruder to
see if there are any visible artifacts
Changing the Nozzle
1. To replace the nozzle on the extruder head, first send
the extruder to the home location.
2. Once the extruder is at the home position, raise the
Z axis by 220 mm. This will give room to work under
the extruder head.
Tools Required
• 7 mm Wrench or Socket Wrench
• Crescent Wrench
Safety Guidelines
• Wear heat resistant gloves.
• Prior to all routine maintenance on the extruder
and/or nozzle, insert 6-inch tall block under
actuator to avoid any type of crush hazard.
• Use appropriate tools for all cleaning
and maintenance.
3. Set the extruder nozzle temperature to 200ºC. This
will melt any plastic inside the extruder and loosen
the nozzle.
4. Once the temperature has reached 200ºC,
use a crescent wrench and 7-mm wrench to
remove the nozzle. Use the crescent wrench to hold
the base steady. Use caution—nozzle is hot!
5. Once nozzle is removed select the replacement
nozzle. Nozzle size can be determined by inspecting
the machined dots along the side of the nozzle. Refer
to the table below for sizes.
6. Once new nozzle has been selected, hand thread it
into the extruder.
7. Then use the wrench and crescent wrench to tighten
the nozzle into the assembly. Tighten until snug. DO
NOT OVER TIGHTEN.
8. Once nozzle is tightened, set the extruder
temperature from 200ºC to 280ºC. This will heat up
the nozzle and ensure it has a tight fit. Make sure
the extruder fan is turned off or the extruder will not
reach the desired temperature.
9. Once the temperature has reached 280ºC, use the
wrench and crescent wrench to tighten. The torque
specification for final tightening of the nozzle should
be 3 Nm or 26.55 in/lbs.
ID DOTS NOZZLE SIZE
0 0.6 mm
1 0.8 mm
2 1.00 mm
3 1.2 mm
4 0.4 mm
5 N/A
Do not touch heated nozzle.
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