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Replacing the Nozzle on your Duplicator 4

To replace your nozzle, first unbolt your extruder. You will need easy access to the nozzles and thermal

cores.

Your extruder needs to be hot when you remove the nozzle otherwise the nozzle can break when you

try to remove it. Use the Duplicators LCD interface to preheat your extruder.

Once it is hot, insert something between the thermal

cores on the two extruders to keep them oriented

correctly -- we used the flat end of a utility knife --

and use a wrench to unscrew the nozzle.

Be careful of the hot extruder. Do not touch the

nozzle or any part of the extruder with your bare

hands, make sure the extruder is on a stable surface

and cannot slip, and work quickly -- metal tools

conduct heat.

Put aside the old nozzle and thread the new one into

the thermal core. The extruder will be very hot, so

be careful when you are adding the new nozzle.If

preferred, you can stop heating the extruder and

wait for it to cool down before adding the new

nozzle. If you do that, remember to heat it up again

for the final tightening of the nozzle.

Still holding the thermal cores in place, start to

tighten the new nozzle into the hot extruder. When

the nozzle is all the way on it will hit the thermal

barrier inside the thermal core. Be careful: it can be

hard to tell when you have hit the thermal barrier,

but over-tightening can strip the threads on the

nozzle.

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Once you have tightened on the nozzle, bolt the extruder back into place.

There is one last thing you should check before you finish: your nozzle heights. Bring the platform as far

up as it will go and check that the nozzles are at the same height relative to the platform. If they are not,you may have to correct them with a shim. Otherwise, you are done. Congratulations, and have fun

printing with your new nozzle!

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