Stratasys uPrint, Service Manual, Page: 315 / 383

6-48
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.
65.
Corrective actions
1.
Material cartridge is jammed or empty. Replace cartridge.
2.
Tips are plugged. Replace the tips
3.
Swivel head is jammed. Attempt to clear the jam, replace the swivel 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 swivel head assembly.
5.
Check for twisted or worn filament guide tubes. If worn replace tubes.
6.
Filament motor is malfunctioning or is disconnected. Verify proper operation and
connections. Test using head maintenance. Also flex the wires while extruding to test for
poor connections.
7.
Broken wire in umbilical cable. Replace umbilical cable.
8.
Check umbilical hose for proper alignment and connection to the head cooling fan.
9.
Head cooling fan has low air flow, replace the head cooling fan.
10.
Z table could be jammed. Check for debris build up around lead screw and guide rods.
Replace Z stage if needed.
11.
Irregular XY table movement, loose guide rods or loose drive belts. Verify the guide rods
are securely fastened and the drive belt tensions are correct. Replace XY table if needed.
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.