Big blob after a while on every print - Hardware, firmware and software help

RISPONDI: Big blob after a while on every print

John Left — Sun, 06 Jul 2025 13:57:39 +0000

Buongiorno, vorrei comprare dallo store un hotend già assemblato per la mia mk2.5s ma non è disponibile, o almeno io non lo trovo. Ho provato a cercare i pezzo singoli per assemblarlo da solo, li ho trovati tutti tranne il doppio cavo rosso che porta la corrente. Inoltre la chat live24/7 sembra non essere più disponibile. Come posso fare? Grazie

RE: Big blob after a while on every print

aasbakk — Fri, 28 Mar 2025 18:45:28 +0000

Thanks again

I had did a bad assembly where heat break and nozzle wasn’t firmly touching I think. Now it’s working again 😀

RE: Big blob after a while on every print

JoanTabb — Sun, 23 Mar 2025 02:03:52 +0000

Good luck.

RE: Big blob after a while on every print

aasbakk — Sat, 22 Mar 2025 22:23:52 +0000

Thank you for your suggestions. I’ll try and fix it during next week.
the heater block had a lot of marks from the filament on it, but I got rid of most of it. Perhaps I should consider replacing it. But I’ll check your suggestions first.
thanks 😊

RE: Big blob after a while on every print

JoanTabb — Sat, 22 Mar 2025 20:41:44 +0000

Is there molten filament at the top of the heater block?
there may be a gap between the heatbreak and the nozzle?

this could cause the issue you mention.

or Overextrusion, could be an issue, PETG Particularly, picks up, on the nozzle and drops off at the least convenient time...
regards Joan

Big blob after a while on every print

Jon Anders Aasbakk — Sat, 22 Mar 2025 19:58:59 +0000

I had to replace the nozzle om my MK2.5. Same 0,4 nozzle as before.

Also replaced the PTFE tube and cleaned the "heatsink?" that the nozzle is screwed into.

I did the XYZ calibration, and the height calibration. The calibration print looks nice.

But every time I print something a blob appears after a while. Maybe about 20 min. Roughly 5x5mm and 2 mm high. After this the further printing is scewed, and I have to stop it.

I don't know what to do to fix this. Can someone help?

Attaced a couple of photos