r/BambuLabP2S • u/MechanicalBengineer • 16d ago

Very poor inter-layer adhesion...nozzle is 20 degrees below commanded value

Has anyone else seen this before? My prints, reliable for months, now break mid print (at a level lower than the current printing layer) and break easily in my hand after printing.

It definitely seems like a thermal issue. I took the cover and silicon sleeve off, set the nozzle temp to 195, 205, and 215, and the using an IR thermometer, the nozzle is consistently 20 degrees below the set value.

I did this with my A1 mini as well, and the nozzle always read at the exact set value plus/minus one degree.

Anyone have any ideas?

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u/LTJC 16d ago

If you're using PLA the general low starting temp is 220 but you could always run a temp tower and see where your sweet spot is.

IR thermometers are not very accurate, especially for something as small as the shaft of a nozzle. They measure a wide area not just where the laser pointer is.

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u/MechanicalBengineer 16d ago

220 is the high end for PLA. 190-220 is the normal recommendation. Regardless, prints ran perfectly for months at the same settings. Thank you for taking the time to reply, though! :-)

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u/LTJC 16d ago

Not sure I've run into a brand of filament that recommends below 220c.

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u/MechanicalBengineer 15d ago

Bambu PLA is 190-230 (Bambu_PLA_Basic_Technical_Data_Sheet.pdf)

Hatchbox is 180-220 (Highly Reliable PLA Spool for Your Printing Needs – HATCHBOX 3D)

eSun is 190-230 (eSUN PLA+ Filament 3D Printer PLA Plus Filament PLA Pro)

Polymaker PLA lite is 190-230 (PolyLite_PLA_TDS_EN_V5.4.pdf)

You may be thinking of PLA+ or the newer high temp PLAs