I got a new Biqu H2V2 for my Ender 3 pro , since myold hotend started getting unreliable and that was a great excuse for yet another upgrade.

I wasn’t happy with the carriage holder I printed, so I wanted to print a new one. After afew hours of printing, I needed to abandon one part, since it was incredibly messy with blobs of PLA gooped on the print. Since I needed the new carriage mount, I didn’t think anything off it and simply abandoned that part and continued the other ones.

Today, I saw that the heating block is completely gooped up with PLA (see pictures). So now, I got two questions:

  1. How should I remove that gunk? I was thinking o| carefully peeling of everything without the silicone sleeve while the hotend is at a low PLA-bending temp, like 150°C, or 175°C.
  2. What caused this? Flowrate too high (the prints look the part)? Too fast extrusion? Heatcreep?

Thanks in advance. (:

  • MaryPot@masto.ai
    2·
    2 days ago

    @Prunebutt

    If it is only external, heat to 230-240 C and use a brass brush to clean it off.

    If it has also clogged inside, heat to 230-240 C and run PETG through to push it out. PETG has a higher melting point than PLA.

    If even that doesn’t work, hubby said something about doing a hard pull, but not sure exactly how he does that, so I’ll leave it up to others to explain.

    • Marafon@sh.itjust.worksEnglish
      3·
      2 days ago

      Hard pull or Atomic pull means to allow the pla inside the hotend to either cool to or heat up to ~80-100°C and then pull it out through the top. The semi melted plastic grabs clogs on its way out. Very easy and effective remedial action for small internal clogs.