Description:

This solution is for replacing a single hot end on a v2 printer. 

Not sure if you have a v1 or v2 style HD printer? Check here: HD V1 or V2


Required Items:

  • HDL, HD or HDx printer
  • Replacement JR or JRx hot end (single)
  • 4mm allen wrench


Process:


1) Turn on the printer with the power switch on the back panel

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2) Heat the nozzle up to 315 degrees and completely remove the filament from the printer. 

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3) Turn the printer off with the power switch and unplug the power cord

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4) Wait for the nozzle to cool to room temperature before moving to the next steps (5+ minutes)

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5) Use the 4mm allen wrench to unscrew the six M6 screws from the back panel. Set aside the back panel.



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6) Remove the bolt from the extruder assembly, and open the latch. 



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7) Remove the white threaded bolt from the extruder assembly.




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8) Remove the grey wire from the extruder assembly clasp




Separate the grey cord from the extruder assembly motor wires (shown in red, green, blue, and yellow.)


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9) The gray cord runs from the hot end all the way to the RAMBo board. Follow it down towards the board and it will split into 3 sets of wires. 




Make a note of where these wires are plugged in, a camera is useful for this. Unplug all 3 of the wires from the board with the connectors attached to the ends of the wires. 


You will be unplugging 3 wired plugs, as indicated in the diagram below with red arrows:


  • One for the heater on the hot end (Heat 0)
  • One for the fan on the hot end (Fan 0)
  • One for the thermistor on the hot end (Thermistor T0)



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10) If there are zip ties holding the hot end in place, cut and remove them. Be careful not to bend the rods during this process. Remove the hot end from the X axis bearing. To do this, bring the hot end up off the X axis bearing in an arc from left to right, using the Y axis bearing as a pivot point.



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11) Remove the hot end from the Y axis bearing. To do this, bring the hot end up off the Y axis bearing in an arc from the back of the printer to the front. 


 


The hot end should now be completely detached from both bearings.


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12) Set the old hot end aside. Be careful not to bend the rods during this process. Take the new hot end and attach it to the Y bearing. Now attach the hot end to the X bearing. The hot end should snap down securely onto both bearings, and should now be securely in place.  




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13)  Replace the gray cord into the clip on the side of the extruder assembly. Wrap the extruder motors around the grey cord for better cable management.



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14) Plug the wired connectors from the hot end into the Rambo board at the appropriate locations.






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15) Plug the power cable back in and turn the printer on. If your VIKI LCD screen says "Error: Min Temp", that means that the thermistor is not plugged in, or that it is plugged into the wrong port. Confirm that the Viki screen does not say "Error: Min Temp".


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16)  Print the calibration file for your printer. The file can be downloaded by clicking the following link. 


Calibration Rectangle Only Gcode


This file will print 2 rectangles around the bed. Each rectangle should should have lines that are merged together completely, as in the photo below.



When the calibration rectangle is printing, do the following:


  • Check to see the hot end temperature is reading correctly (240 degrees).
  • Check to see the hot end fan working
  • Check to see that the hot end heats


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17) Once the calibration print has been run correctly, put the back panel on the printer. Secure the back panel in place with the 6 screws. You are now ready to print the files of your choice.


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Please open a Tech Ticket if you have any questions or need assistance with this process.



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