Instructions
SINGLE HEAD - USER MANUAL
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8.3. Removing clogging of the extruder
The number one inconvenience that you will run across when 3D printing is clogging of the extruder. But we have
good news for you! This problem can be easily avoided by following a few simple rules of “3D printing etiquee”.
• First, always wait until the extruder is fully heated ti its intended temperature before inserting the filament.
Inserting the filament at a lower temperature is just asking for a clog.
• When unloading or changing the filament: always heat up the extruder all the way first. Then “Extrude” for 5
seconds and then immediately press “Reverse” aiding the filament retrieval by pulling a lile bit on the filament
end coming out of the extruder with your fingers. The “Extrude” is necessary, because the hotend need to melt
the whole previously melted filament.
• If the extruder is clogged clean out the passageway of the extruder. You can use one of the small hex wrenches
that came with the Crabot. To do so. Heat up the extruder to 250 °C While the extruder is empty push down any
excess filament out by plunging the hex wrench down into the passageway: Make sure to do adequately but not
in a violent way which would damage the machine, and always take precautions because the extruder is very hot!
• It is especially important to clean out as much old filament leover between using different filaments, as the
different characteristics of the filaments’ properties (even printing the same material in a different color) can
cause clogs from inconsistencies. For example: you must heat up to 250°C to clear out any extra ABS before using
PLA.
Clogging is the most common problem in every 3D printer and cannot be prevented 100%, but if you follow these
simple steps you will prevent 95% of occurrences. If you still cannot clear the passage with just this method, you may
want to move onto the next method by following these next steps to actually remove the nozzle itself…
8.4. Removing the nozzle
Remove the filament from the head or cut the filament at
the point closest to the extruder.
• Remove the head only when it completely cooled to
avoid burns.
• In the Navigation menu, lower the bed level for
convenient head access during the process.
• Turn off the printer.
• The fan assembly on the head can be removed using
the 2-2 screws on the sides. The fan unit can then be
easily removed.
• Loosen the screw on the head at the boom of the
silicone cover, but do not unscrew it. Pull out the
heat cartridge and temperature sensor from the
Heat-block.
• Loosen but not remove the 2 screws on the le side
of the black Heat-sink.
• This allows the boom head to be pulled out of the
black block.
• Unscrew the nozzle and heat-break with wrenches.
• The two parts can now be cleaned comfortably with
the Cleaning Kit.