Silicone Insulated Heater Blocks – How To – MakerBot Rep 2X

silicone insulated makerbot 2x

These are the directions to replace the Silicone Insulated Heater Blocks on your Replicator 2X. If you are replacing both, simply follow the directions twice. Silicone is one way to provide insulated heater blocks for the dual extruder head on the MakerBot Rep 2X.

The tools you’ll need:

Silicone Heater Block - Insulated Heater Blocks

 

1. Turn off and unplug your 3D printer

  • Remove the acrylic plates if you don’t already.

2. Bring your extruder assembly to the front

extruder assembly zip tie Rep 2X plastic motor spacer

  • Cut off the zip tie and remove the plastic holder.

3. Remove the two hex bolts underneath the extruder assembly

Gantry hex bolts - MakerBot Rep 2X - silicone insulated heater blocks

  • Remove the entire assembly from the gantry.
  • Place it on top of the machine for easy access.

4. Remove the two fan bolts

Fan guard - hex bolts - Replicator 2 double extruder

  • These bolts hold the fan guard to the fan, the fan to the heat sink, and the heat sink to the bar mount assembly.

5. Unplug and remove the motors from the assembly.

  • A set screw should be revealed on the bar mount assembly.

6. Remove the thermal barrier tube from the bar mount assembly.

makerbot parts insulated heater block makerbot parts straighten thermocouple makerbot

  • Loosen this set screw.
  • Straighten the black wrapped end of the thermocouple, so as not to damage it while removing the assembly.
  • Pull down on the heater block until the thermal barrier tube is free.

7. Remove the heater cartridge by loosening the set screw on the heater block.

Remove heater cartridge - MakerBot parts INSULATED HEATER BLOCK SILICONE

8. Loosen the nozzle with your socket set.

nozzle rep 2x - insulated heater block

  • You may want to place one of the large hex keys through the hole for the heater cartridge for leverage.

9. Loosen the thermocouple.

loosen the thermocouple - insulated heater block

  • Either by hand or with your pliers.
  • Remove the heater block from the thermocouple.
  • DO NOT twist or bend the wires of the thermocouple, this will cause damage and require a replacement.

10. Remove the thermal barrier tube from the heater block.

  • Use your crescent wrench.

11. Start installing your new Silicone Insulated Heater Blocks.

new insulated heater block kit - replacement - silicone

12. Screw in your thermal barrier tube.

thermal barrier tube install - insulated heater block

  • Proper height is if the notch of the unthreaded portion is aligned with the top surface of the heater block.

13. Attach the nozzle.

  • Tighten first by hand, then with the socket.

14. Make sure the nozzle and thermal barrier tube are tightened.

 nozzle and barrier tube tight - insulated heater block -rep 2

  • Once the nozzle is tightened, try unscrewing the barrier tube by hand. If it comes loose, you’ll have to unscrew the nozzle a few turns, screw in the tube a few turns, and then screw back on the nozzle until it is tight. The two parts may not have been close enough together inside the heater block the first time you tightened them.

15. Screw on the thermocouple attachment by hand.

rep 2 thermocouple - insulated heater block - hand tighten

  • Then tighten with pliers.

16. Push the thermal barrier tube, and thus the heater block assembly, back into the bar mount.

insulated heater block back into bar mount

17. Grab your alignment jig.

insulated silicone heater blocks - dual extruder - makerbot

  • The alignment jig snaps onto the bar mount assembly. Align both extruder heads so they are aligned with the jig.
  • If you find that the one you are not working on is far tighter to the jig than the other, remove that stepper motor and align properly.

18. Once aligned, tighten the set screw.

insulated silicone heater blocks - dual extruder - makerbot

19. Put heater cartridge back in, tighten with the heater block set screw.

 

20. Push the thermocouple wire back into its slot on the bar mount.

thermocouple wires into slot

21. Replace the stepper motor, plug it in.

 

22. Replace the heat sink, the spacers, the fan, the fan guard, and the hex bolts.

heat sink makerbot 2x dual extruder

  • Make sure the fan’s label is facing down.

23. Reattach the extruder assembly to the gantry system

gantry system - new silicone insulated heater blocks installed - makerbot rep 2x

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