Anet A8 3D Printer- Leaking block assembly

A cheaper way to fix your leaky block assembly!

Leaking 3D printer (Anet A8) extruder head?

With the original extruder block assembly, you may run into problems with leaking. After a few prints, my extruder began to leak above the block after I tried clearing it of its clog. Many people may just recommend you to buy a new block assembly for the Anet A8, because the original is no good, however, I have found a better solution by using past plumbing experience and reviewing the specs of sealant tape with Polytetrafluoroethylene.


Figure 1. Oatey Thread Seal Tape


Figure 1 contains some thread seal tape that I picked up from my local Dollar General. You can pick up any threaded tape, but I suggest you do your research about the item at the manufacturer’s website. When operating 3D printers, the part that you need sealed around the thread gets VERY hot, you should double check if that specific brand can handle your operating nozzle temperature. Most tapes can handle these temperature (since they are used in sealing hot water heater tubing, etc) , but looking up these things makes you better at understanding the system you built from the ground up.









Figure 2. Sealant tape specifications


Using either formula you get a max value of 260°C


This means that this tape will tolerate the printer nozzle temperature.



















Leakage areas


Image 1. Block assembly showing areas of leakage




Note: The next steps help leakage at these points only.

At #1, during operation, filament extrudes up from the nozzle and spreads across the top of the block.

At #2, it drips out the top of the nozzle





Applying the tape

  1. Grab a pair of scissors and your sealing tape.
  2. Cut about an inch of tape off.
  3. Cut that tape in half on the long side.
  4. Compare the tape’s height with your nozzle height

and cut accordingly.

  1. Do these same steps for your threaded block rod.
  2. Screw the nozzle and rod back into the block.

 Image 2. Tape and Scissors










Image 3. Nozzle before sealant tape









Image 4. Nozzle after sealant tape





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