Loss Of Extrusion (Loe) - HP Designjet 3D Service Manual

Loss of Extrusion (LOE)

Characteristics: Material strands inside build envelope and/or partially built
parts. Either the model or support material has failed to extrude from swivel
head or toggle plate assembly. Can also be caused by a part falling over or
a part shift.
Here the support material has had a loss of extrusion, causing the model
material to continue to extrude without support material under it. If the
model material has had a loss of extrusion, the scenario would be
reversed, the support material would have extruded with no model
material under it.
Corrective actions:
NOTE: Also reference Troubleshooting Guide for diagnosing and
correcting LOE issues.
1. Material cartridge is jammed or empty. Replace cartridge.
2. Tips are plugged. Replace the tips
3. Toggle assembly is jammed. Attempt to clear the jam, replace the toggle
head assembly if needed
4. Liquefier heater has higher than normal resistance, value should be
between 175 and 216 ohms. If resistance is too high, replace the toggle
head assembly.
5. Check for twisted or worn filament guide tubes. If worn replace tubes.
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