HP Designjet 3D Service Manual page 125

Is there a short
No
piece of filament in
the liquefier inlet?
1. Filament Missing at Drive 2. Filament Tail Left at
Wheel Liquefier Inlet
H. Loss of Extrusion (LOE)
Use flow chart to determine type of LOE, then follow the steps below.
1. Filament Missing at Drive Wheel
- Filament tube disconnected
- Filament pulled back
Remove head cover and inspect
liquefier inlet
Are both filaments
No Yes
present at drive
wheel?
Yes No
Enter head maintenance and try
to extrude
Did both filaments
No
extrude?
3. Filament Present but
Won't Extrude
No
4. Intermittent LOE
1. Verify that filament tube is connected at all
junctions.
2. High pull force on the material spool.
a. Verify spool lid is inserted properly and
not rubbing on carrier.
b. Remove any debris from bottom of
carrier.
c. Filament is tangled on spool. Replace
spool.
3. High pull force in filament tubes.
a. Inspect filament tubes and Y block for
debris. Remove debris.
b. Inspect for kinked filament tubes.
Replace filament tubes.
c. Check for twisted feed tubes in energy
chain. If twisted, replace filament
tubes.
Is there excess
Yes
material inside the
head?
6. Excess Material Inside Head
Yes
Did model or
Yes
support features
fall over?
5. Part Geometry Failure
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