Ender 3 HotEnd Fix, Common Issues and How to Fix

The majority of printers have a hot end. Unfortunately, a defective hot lot interferes with the quality of your production. Fortunately, a desirable future is fixable. Below we are going to discuss Ender 3 HotEnd fix in detail. However, this information is relevant for most 3D printers.

What is the HotEnd?

Can you locate your hot end on your printer? A desirable lot is a component that heats the filament and melts it for consistent, smooth prints for those new in the printing business. A hot end also controls and maintains the temperatures of the printer.

A red hot sink characterizes most hot ends in 3D printers. The extruder pushes the filament to the hot end, which is melted. Finally, the filament is melted, and layers fall on top of each other to produce a perfect 3D print.

The printer’s hot ends are prone to jam. Once you cannot control your printer’s temperature, your hot end is not working correctly and needs to be fixed.

Below are some of the most common indicators your hot end is not working. 

  • If your Ender 3 Printer jams frequently.
  • Presence of thermal Runaway errors.
  • Inconsistent printing.
  • Presence of a clicking sound when you are printing.

We will discuss each problem and how it can be fixed. Note that these issues are not only found in Ender 3. They are consistent with most 3D printers.

A hot end has two temperatures: An upper cool zone and a lower hot zone. The heater cartridge heats the hot zone while the heat sink and fan cool the excellent spot.

As the filaments pass through the top hot, they travel through the PTFE tube. The cool zone ensures that the filament stays cool and rigid. The hot end is where the filament is melted and deposited in layers into the print.

What is the role of the fantastic end on a 3D printer?

As the filament is melted through the hot end, it is deposited in the print through the nozzle. A heat break surrounds the PTFE tube where the filament passes. As the filament passes through the cool zone, temperatures are lost, maintaining enough temperature to keep the filament rigid. 

If the filament is not passed through the cool zone, it will cause the printer to jam.

HotEnd’s Most Common Issues

1. Your printer’s filament does not heat up to the required temperature.

If the hot end does not melt the filament to the required temperature, then there is a possibility that the PTFE will be blocked. However, the fantastic end will be working as usual therefore cooling the filament before the nozzle.

2. The filaments melt too soon on the hot end

If the hot end is melting the filament too soon, then the cool end cannot cool it efficiently. The deposited layers will be inconsistent therefore making the print rough.

3. The hot end stops working completely

Sometimes the hot end stops working completely. No printing can take place when the filament is not heated.

If you notice your Ender 3 3D printer is not working as expected, check if the hot end is the problem.

Fixing the Ender 3 Hot End.

This step-by-step guide does not only work for the Ender 3 printer. If you have any 3D printers, you can follow the guide to fix or replace your hot end.

1. Remove the hot end fold.

You will need to open the shroud to assess the problem. Then, use the Allen wrenches to remove the screws that attach the enclosure to the hot end. You can get internet videos that show all the steps of removing the partition.

2. Replace the thermistor

After removing the enclosure, it is easy to repair the thermistor. Here is a detailed guide to help you replace the thermistor.

3. Replace the heater Cartridge

Sometimes the Cartridge is why your hot end is not working correctly. If the Cartridge is the problem, you will have to change it entirely with a new one.

4. Replace the HotEnd fan

The fan might be jammed when the cool end does not regulate the temperatures as expected. Replace the fan with a new one for effective printing.

5. Replace the whole HotEnd system

Your printer’s hot end might be faulty due to time factors or other aspects. If that is the case, you can buy a new hot end kit. Make sure the hot end you are buying is compatible with your printer.

Ensure that the hot end is not defective and research if it works efficiently by reading product reviews.

Frequently Asked Questions (FAQs)

  • Ender 3 uses what kind of HotEnd?
    An Ender 3 has a Teflon tube (PTFE) where the filament passes through from the hot end. The PTFE is covered by a heat break that regulates the filament’s temperature. It also has a nozzle mostly made of brass or aluminum with a heater block.
  • Is a direct drive for Ender 3 worthwhile?
    Provided you regularly check if all the components of your printer are working are required, your printer can serve you for a long time.
    To ensure that the quality of your production is standard or perfect, check the status of your hot end.
  • Why is my nozzle oozing?
    Your printer’s hot end might be assembled wrongly. For example, your nozzle might be loose, which causes a leak. Although you can print with a leaking HotEnd, it would be best to tighten the nozzle if open or replace it if it is faulty.
  • How do you clean hot ends?
    3D printers came with all the tools required for cleaning and fixing. For example, if you suspect your hot end is clogged, you can use the nozzle clean kit. 
    Detach the enclosure on the hot end and use a cleaning filament or a brass wire brush.

Related: How to Replace Nozzle, Step by Step


Replacing your Ender 3 HotEnd is not a difficult task. Use detailed tutorials available on the internet to assess your printer’s issue and do the fixing.

When the HotEnd is working effectively, then your print will be perfect. Regularly check the temperature of the thermistor to find out if there is a problem.


3 thoughts on “Ender 3 HotEnd Fix, Common Issues and How to Fix”

  1. Question>>>
    Ender 3 Pro.
    Heating into the red part (heat break) and jamming filament.
    Replaced entire hot end and same results.
    Any suggestions of what to look for?

  2. Lots of good info here. Thanks.
    I have had a Ender3 Pro for about 6 weeks and started having problems with the filament not feeding.
    I have changed the hot end with no change. I have turned the flow rate down in Cura with no change.
    It seems like the filament is melting to high up in the (cool spot).
    Any suggestions would be appreciated.

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