Vision Miner Wiki

Hotend Disassembly

A properly maintained tool head is crucial for consistent print quality. Over time, filament residue, clogs, or worn-out components can cause print failures.

Before you begin – safety and risk

Read the Safety – Before You Begin article to understand the hazards involved in working on the Vision Miner 22IDEX V4 – including electrical, thermal, mechanical, and chemical risks. All procedures in this wiki are provided as recommendations only. By choosing to follow any procedure, you do so at your own risk.

Start here: this procedure covers full hotend disassembly for maintenance, inspection, or component replacement. If you only need to change the nozzle, see Nozzle Change for a faster procedure. For clog clearing without full disassembly, see Clearing Clogged Hotend/Unclogging.

Tools and Materials

  • Wrenches:
    • 7 mm (or 9/32") for nozzle removal
    • 12 mm or adjustable wrench for holding the heat block
  • 2 mm Hex Driver (commonly used for fan shroud/extruder and grounding wire screws)
  • Pliers or Adjustable Wrench (to hold the heat block during nozzle changes)
  • Boron Nitride/Thermal Paste (for the heater, sensor, nozzle, heat break)
  • Spare Components (optional):
    • Nozzle
    • Heat break
    • Heater cartridge
    • Temperature sensor (PT1000)
    • PTFE tube
  • Protective Equipment:
    • Heat-resistant gloves
    • Safety glasses

Reference documents

1. Removing Filament

  1. Preheat the hotend to the filament's printing temperature.
  2. Unload the filament:
    • Automated: Use the printer's unload filament feature (if supported).
    • Manual: In the web interface (Dashboard), click Retract (100 mm at ~7 mm/s), or use the extruder's lever to pull the filament out by hand.
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  1. Reference: If unsure, see the Filament Loading/Unloading.

Always remove filament while hot

Molten plastic will help prevent clogging or filament residue in the nozzle and heat break.

If filament won't retract

If the filament is stuck or the extruder motor clicks without moving the filament, see Filament Won't Retract in the Troubleshooting section.

2. Removing the Nozzle (While Hot)

  1. Heat the hotend to printing temperature (or slightly lower, e.g., 20–30°C below standard printing temp).
  2. Secure the heat block with pliers or an adjustable wrench.
  3. Unscrew the nozzle clockwise (looking up from the nozzle tip) using a 7 mm wrench.
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  1. Caution: The metal components will be extremely hot. Wear heat-resistant gloves and avoid contact with any heated surfaces.
  2. Cool Down: After nozzle removal, power off and allow everything to cool to a safe handling temperature.
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Why remove the nozzle while hot

Removing the nozzle hot prevents hardened filament from binding the threads. This reduces the risk of damaging the heat block or nozzle.

If the nozzle is clogged

If you cannot remove the nozzle or suspect a clog, see Nozzle Still Clogged in the Troubleshooting section.

3. Power Off & Disconnect Wires

  1. Power Off
    • Power off the printer by unplugging it from the wall to ensure complete electronic safety.
  2. Remove Distribution Block Connections

Document wire connections before removal

Take a photo or label wires beforehand to track polarity and connections.

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  • Gently unplug the heater, thermistor/temperature sensor, grounding wire, and any other hotend-related wires.
  • How to Disconnect:
    1. Using a 2 mm hex screwdriver, press down on the orange spring-loaded tab inside the distribution block opposite to the wire you want to remove.
    2. Support the distribution block from the back to prevent applying excessive force on the tool head.
    3. When the tab is fully pressed, gently pull the wire straight out.
    4. Do not force the wire out, as this can cause damage.
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4. Removing Fan Shroud & Wire Guard

  1. Remove Fan Shroud:
  2. Use a 2 mm hex driver to remove the two screws holding the fan shroud in place.
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  1. Slide off the shroud and carefully set it aside with the fan (if still attached).
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  1. Remove Wire Guard:
  • Remove any wire cover to fully access the extruder/hotend area.
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5. Remove Grounding Wire (Lug Style Crimp)

Before proceeding to remove the hotend assembly, you must disconnect the grounding wire at the hotend.

  1. Locate the lug-style crimp attached to the hotend body (see picture below).
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  1. Using a 2 mm hex screwdriver, remove the screw holding the lug in place.
  2. Carefully set the grounding wire and lug aside for later reinstallation.
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Grounding wire is essential for safety

This wire is essential for proper grounding. Ensure it only contacts the hotend metal surface to avoid electrical issues.

6. Removing the Hotend Assembly

  1. Extruder Front Plate:
  • Using a 2 mm hex driver, remove or loosen the front plate screws on the extruder (often 2 screws).
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  1. Slide Out the Hotend:
  • Pull the hotend toward you (forward).
  • If the hotend doesn't slide out easily, gently shake it from side to side while pulling it towards you.
  • Check for stray filament or debris that might prevent smooth removal.
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7. Disassembling the Hotend

Once the hotend is free from the extruder, you can break it down into its core parts:

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  1. 3D Printed Interface/Adapter:
  • Remove the top interface plate that mates the hotend to the extruder.
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  1. PTFE Tube:
  • Inspect the PTFE tube inside the radiator. Confirm it's flush and cut to correct length.
  • Replace if damaged or too short.
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  1. Cooling Fan:
  • Unscrew 2 screws and remove the fan.
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  1. Radiator:
  • Loosen the screw on the radiator and remove it.
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  1. Heat Break:
  • Unscrew the Heat Break.
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  1. Heater Cartridge & Temperature Sensor:
  • Remove heater cartridge and temperature sensor by loosening the set screws.
  • Gently slide these out if they need replacement or inspection. They're often secured by small set screws.
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Inspect wiring and apply thermal paste

  • Grounding Wire: Check if the grounding wire is worn out, burned, or excessively bent due to heat exposure. Replace if damaged.
  • Fan Wires, Sensor Wires, Heater Wires: Ensure no fraying, burning, or other damage.
  • Tip: Apply Boron Nitride/Thermal Paste to threads and surfaces (nozzle, heat break, sensor, heater) as needed for heat conduction and easier future removal.

8. Reassembling the Hotend

Reverse the disassembly steps:

  1. Install or Replace the Temperature Sensor & Heater:
  • Lightly coat each component with thermal paste.
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  • Slide them into the heat block.
  • Secure with the set screw (do not overtighten).
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  1. Attach the Heat Break:
  • Thread the heat break into the heat block finger-tight. Avoid applying torque to the thin heat break walls.
  • If using a Copperhead® or similar, refer to the manufacturer's instructions for correct orientation/fit.
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  1. Reattach the Radiator:
  • Slide the heat break into the radiator.
  • Tighten the set screw carefully.
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  1. Reattach the Cooling Fan:
  • Attach the fan to the radiator.
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  1. Reattach 3D Printed Interface Plate and PTFE Tube:
  • Attach the interface plate to the radiator.
  • Reinsert PTFE tube. Ensure correct length and flush fit. This prevents gaps that cause clogs.
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Additional reference

For more details on sensor and heater installation or wiring inspection, see Hotend Temp Sensor & Heater Maintenance.

9. Reinstalling the Hotend Assembly

  1. Slide the Hotend back into the extruder grooves.
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  1. Secure it with the original screws on the front plate.
  2. Reconnect the Grounding Wire:
  • Fasten the grounding wire to the hotend body using the 2 mm hex driver.
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Grounding wire must only touch hotend metal

This wire must not touch any other metal components except the hotend itself. If it does, Z-Probe (ground detection) may fail, and you risk damaging your printer.

  1. Reconnect Other Wires:
  • Follow your reference photo or wiring diagram for heater and sensor polarity.
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  1. Reinstall Fan Shroud & Wire Guard:
  • Replace the fan shroud using the 2 mm hex screws.
  • Make sure wires, including the grounding wire, are tucked properly under the wire guard without excessive bending or contact with other metal parts.
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10. Final Steps & Nozzle Installation

  1. Initial Tightening:
  • Thread the nozzle in counter-clockwise (from the bottom) by hand or at ~1 Nm torque.
  • Hold the heat block with a wrench to avoid twisting the heat break.
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  1. Heat Soak:
  • Heat the hotend to your normal printing temperature.
  • Let it sit for a few minutes to ensure all components expand and seat properly.
  1. Final Tightening:
  • Once hot, use your wrench again to slightly re-tighten the nozzle (still around 1–1.5 Nm max).
  • This helps prevent leaks around the threads.
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  1. Perform a Test Extrusion:
  • Load filament to confirm a clear path and ensure no jams or leaks at the nozzle.
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Detailed nozzle change procedure

For a detailed walkthrough of nozzle changes, see Nozzle Change.

  1. Perform a Calibration:
  • In the web interface go to the Macros tab and navigate to System > Calibration > Auto Calibration Macros.
    Start Z - Offset Calibration and follow the instructions on the screen.
  • Start Tool Height Auto Calibration and follow the instructions on the screen.
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If you encounter issues after reassembly:

Troubleshooting

If you encounter issues during or after the procedure, work through these common problems:

FAQ

Support

If you could not find an answer here, reach out to our support team.

On this page

Tools and Materials1. Removing Filament2. Removing the Nozzle (While Hot)3. Power Off & Disconnect Wires4. Removing Fan Shroud & Wire Guard5. Remove Grounding Wire (Lug Style Crimp)6. Removing the Hotend Assembly7. Disassembling the Hotend8. Reassembling the Hotend9. Reinstalling the Hotend Assembly10. Final Steps & Nozzle InstallationTroubleshootingFAQSupport

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