MakerBot Replicator 2X Troubleshooting And Maintenance page 27

DIAGNOSING PRINT QUALITY ISSUES
Loose drive gear: If the drive gear in the
extruder comes loose on the extruder motor
shaft, the gear cannot grip the filament
and drive it down into the extruder. Use the
Disassembling an Extruder section on page
10 to remove the motor assembly from the
extruder. Then:
1. Use the 2 mm hex wrench from the
accessory box to remove the two bolts
holding the drive block to the extruder
motor. Remove the drive block and set it
aside. Be careful with the drive block – if
any of the pieces are detached, you might
have a difficult time putting it back together.
2. Ensure that the drive gear is in the correct
position on the motor shaft. The top of the
drive gear should be about 2 mm from the
end of the motor shaft. Locate the set screw
that secures the gear to the motor shaft
and make sure it touches the flat side of the
motor shaft.
3. Use the 1.5 mm hex wrench from the
accessory box to tighten the set screw
against the motor shaft.
CONTINUED
4. Return the drive block to the motor. Orient
it so that the extruder lever arm points in
the same direction as the white connector
on the motor. Secure the drive block using
the 2 mm hex wrench and the two bolts you
removed earlier.
5. Return the extruder motor assembly to
the extruder carriage.
6. Reconnect the motor wire harness to the
top of the extruder motor.
7. As one piece, return the fan guard, the
fan, the heat sink, and the spacers to the
extruder. [Fig 1.3] Use the 2.5 mm hex
wrench to tighten the two bolts at the lower
corners of the fan guard.
XYZ Motor Cable: There may be a problem
with the section of the motor cable leading
to the X-axis motor. If so, the cable will need
to be replaced. Get in touch with support@
makerbot.com for more information.
TROUBLESHOOTING 27