HOT END REPLACEMENT- JR2x (DUAL) v2 Upgrade

1) Heat the nozzle and remove the filament from the extruder/printer

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2) Close the extruder assembly

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3) Turn off and unplug the printer

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4) Remove the six M6 screws from the back panel

• Set the screws aside, you will need them for later

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5) Remove the back panel and set aside

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6) Pull the extruder pin, release the latch,

• Set the extruder pin aside
• Remove the PTFE tubing from the adapter

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7) Unplug the hot end wires (3) [grey cord] and the extruder motor wires (1 plug)

• Use the solution RAMBo Detailed Wiring Diagram

-Step 3 to remove the connector “E0-Motor”

-Step 6 to remove the connectors “Heat 0”, “Fan 0” and “T0”

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8) Unwrap the grey cord from the extruder motor wires

• Pull the grey cord through the slot under the extruder motor
• The hot end will still be attached to the machine but all the wires will be now unplugged

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9) Remove the current hot end from the cross rod (Make sure to cut the 2 zip ties if they are still on your hot end)

• First release the hot end from the bearing in the X ­Direction, do this by rotating the head around the y bearing
• Then release the hot end from the bearing in the Y ­Direction (back to front)
• The current hot end should be completely separated from the printer and can be set aside

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10) Now you will need the 2nd extruder assembly, the 3 button head screws and a 2.5 mm allen wrench

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11) Hold the extruder assembly in the top corner and thread the two shorter screws (M3x20) through the top

panel and into the extruder assembly

• Make sure to start the threads without pressing the nuts out of their hex slots
• Just start the screws and leave them a little loose

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12) Screw in the longer screw (M3x35) through the inner side panel and into the extruder assembly

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13) Then tighten all 3 screws until they are snug

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14) Next, change the back half of the bearing holder (this can be accessed through the back of the printer)

• Notice that the 2 screws are different lengths (longer screw on top, shorter screw on bottom)
• Make sure the screws are snug and the printed part is pointed in the right direction

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15) Feed the grey cord through the slot under the extruder motor

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18) Press the PTFE tubing into the plastic white adapter (make sure it is bottomed out inside the adapter)          

• Insert the E-­clip into the plastic white adapter
• Do this for both extruders

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19) Calibrating the nozzle height

• Please follow the solution HD2x-JR2x Dual Hot End Calibration (v2)

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