Comment on Issues with layer adhesion post bimetal heatbreak and hardened steel nozzle install.
empireOfLove@lemmy.one 11 months ago
Layer adhesion almost always means plastic is extruding too cold. Especially if the adhesion problems are happening on layers off the build plate. Keep bumping the temp and maybe use less part cooling fan- you can’t really make it worse at this point.
Hardened steel nozzles do not conduct heat nearly as well as typical brass nozzles. (The thermal conductivity of steel is around 40w/m-K for high alloys, while for brass it is 110w/m-K). It cannot heat the plastic up nearly as fast.
I usually start at 210C for PLA on my Prusa mk3’s with a brass nozzle, and will back down to 200/205 if there’s more overhangs or too much stringing. But on the printer set up with a steel nozzle I ended up around 225C to get results comparable to 210 on the brass nozzle.
rug_burn@sh.itjust.works 11 months ago
This. I’d avoid using the hardened nozzle until you have a filament that requires it (glow in the dark, wood, CF, etc). Between the part cooling fan and the poor thermal conductivity of the steel (assuming you do have the nozzle fully tightened), it’s an uphill battle. If you really need that nozzle more or less permanent, try using an enclosure to keep ambient temps up, but note PLA doesn’t necessarily do well in enclosures that get too hot