Removing Backflow From The Head - Stratasys FDM 2000 Manual

Procedures

Removing Backflow from the Head

If power is completely cut off from the FDM, the cooling fan also shuts off at the
same time. This happens whenever the FDM is unplugged. It also occurs during
a power outage. If the FDM remains off for more than one hour because of one
of these reasons, any filament remaining in the head can back up out of the
liquefier and harden, preventing further flow. If a plug occurs, the operator
should take the following steps to unplug the head.
1) Unlatch the head.
2) Open the head and snip the filaments.
3) Lift the head off the hinges.
4) Pull the head away from the back plate and allow it to rest on the bottom
shelf of the FDM.
It might be helpful to lower the Z stage platform before removing
backflow.
5) Remove the motor block if necessary.
The tweezers supplied by Stratasys can often be used to remove excess
material without removing the motor block.
It might be necessary to unclip the cable for easier access to the set
screws. The operator must remember to reclip the cables before reattach-
ing the head to the back plate.
a) Use an Allen wrench to remove the cap screws holding the motor
down.
b) Lift the motor block away from the head and set it aside.
6) Carefully cut away the excess material with the cutting tool supplied by
Stratasys.
7) Replace the motor block.
a) Place the motor block into the head so the two dowel pins under the
motor lock in place.
b) Insert the cap screws and tighten them to a snug seal with an Allen
wrench.
8) Close the head and start a filament load procedure. Be careful to keep
tension on the filaments while closing the head, so they do not kink.
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Usage— Modeling Operations
10MAY01
F2/3/8000-23