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Comment on Help please: heating block gooed up with PLA

You have an incorrectly torqued connection between the heatbreak tube, nozzle, and heater block that is allowing filament to work its way past the threads and out the top/bottom. You’ll likely need to clean off what you can while hot in order to get it to a place where it can be disassembled and fully cleaned.

You may need to heat or even torch some of those parts clean, since there’s no generally available solvent for PLA to soak it off.

To prevent this, make sure you’re properly torquing those parts together according to the manufacturer’s instructions. Final torque is normally applied with the hotend empty and at temp.

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Prunebutt@slrpnk.net ⁨2⁩ ⁨days⁩ ago
Harumpf 🙄😤. It came like that. I only attached the extruder to the printer. I didn’t expect that I need to open it up.

Maybe I should have fastened the nozzle, though.

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- gafu@techhub.social ⁨2⁩ ⁨days⁩ ago
  @Prunebutt @Fenderfreek
  Its not about torque only.
  If build up correct, the nozzle flange does not touch the aluminium heater block. There must be a gap, can be a tiny gap.
  You dont want to screw the nozzle against the block, but you want to screw the nozzle backside face (around the filament bore) against the heatbreak end face. This is the place where you close the oozing hole, the threads are not tight against liquid plastic.
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  - Prunebutt@slrpnk.net ⁨1⁩ ⁨day⁩ ago
    So that means I need to teardown the extruder and check the seal of the heatbreak?
    
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    Fenderfreek@lemmy.world ⁨1⁩ ⁨day⁩ ago
    Sort of. As the previous poster pointed out, you need to make sure it’s assembled in a way that the nozzle is seated against the heat break inside the heater block, not against the heater block itself. You’ll have to do a complete disassembly to clean it up properly, and you may need to run a tap through the heater block to clean the threads, but when you assemble it, make sure that you back the nozzle off a turn or so, assemble the hot end so that the heater break is bottomed out against the nozzle, then heat it all up and torque the nozzle up snugly to the heatbreak. There are YouTube vids that will demonstrate hotend assembly better than I can explain it, but solid nozzle to heatbreak seal is critical for preventing this
    
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unexposedhazard@discuss.tchncs.de ⁨2⁩ ⁨days⁩ ago
Yeah something is mega fucked. Never seen it like this.

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