Anycubic Leaking Hotend Issue (Hint, Open a Support Ticket)

3D Printers3D PrintingHow To's Chris Wyatt 24 October 2024

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Ah, the dreaded hotend leak! A common frustration for 3D printing enthusiasts, especially Anycubic owners. Let’s troubleshoot this. Here’s a breakdown of the usual suspects and how to fix them:

Important Notes for Anycubic Owners:

• Specific Models: Some Anycubic models, like the Kobra, have had known issues with hotend leaks. Check Anycubic’s website or forums for potential recalls or replacement parts. As with the Anycubic Kobra 3 model, Anycubic are now replacing them with a new reenforced version.  Just open a support ticket and upload a photo.
• Quick-Release Hotends: If you have a quick-release hotend, ensure it’s properly locked in place.

As for the other known issues with possible fixes see below.

1. Nozzle Issues:

• Loose Nozzle: This is the most frequent culprit. The nozzle needs to be snug against the heat break to create a proper seal.
  • Fix: Heat the hotend to printing temperature. Carefully tighten the nozzle with the appropriate wrench while holding the heater block to prevent it from turning.
• Damaged Nozzle: A cracked or warped nozzle can cause leaks.
  • Fix: Replace the nozzle with a new one.

2. Heat Break Problems:

• Loose Heat Break: The heat break needs to be firmly connected to both the heat sink and the heater block.
  • Fix: Heat the hotend. Carefully tighten the heat break using two wrenches to prevent twisting and damage.
• PTFE Tube Issues (if applicable): If your hotend uses a PTFE tube, make sure it’s properly seated in the heat break and the nozzle. A gap or worn-out tube can cause leaks.
  • Fix: Trim the PTFE tube for a clean end and ensure it sits flush against the nozzle. If it’s worn, replace it.

3. Heat Block Troubles:

• Loose Heat Block: If the heat block isn’t securely attached to the heat break, filament can leak.
  • Fix: Heat the hotend. Tighten the heat block screws carefully.

4. Filament Issues:

• Incorrect Filament Diameter: Using a filament with a diameter that’s too large or too small can cause leaks.
  • Fix: Use the correct filament diameter for your hotend.
• Wet Filament: Absorbed moisture in the filament can turn to steam in the hotend, causing pressure and leaks.
  • Fix: Dry your filament using a filament dryer or a low-temperature oven.

5. Clogged Nozzle: A partially clogged nozzle can lead to pressure buildup and leaks. * Fix: Heat the hotend and use a cleaning needle to carefully clear any blockage.

6. Thermal Expansion: As the hotend heats up, the metal parts expand. Over-tightening when cold can lead to leaks when hot. * Fix: Tighten components when the hotend is at printing temperature.

If you’ve tried these steps and still have leaks, it’s best to:

• Consult Anycubic Support: They can provide specific guidance for your model and may offer replacement parts.
• Check Online Forums: Search for your specific Anycubic model and “hotend leak” to find solutions others have found.

Remember to be patient and methodical when troubleshooting. With a little detective work, you’ll have that hotend sealed and printing smoothly in no time!