Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
I've recently switched from using a standard Prusa brass 0.4 mm nozzle to a P3D Apollo 0.4 mm nozzle.
After adjusting Z height a few times I've found that bed adhesion (with ASA) is a lot less than it was before: the 16 hour print that I had printed successfully many times before changing nozzle now detaches from the bed at around 12ish hours into the print.
I'm using the same filament (rigid.ink ASA), the same heat-bed and the same gcode file is being printed so all I can think of is that the 60% improved conductivity of the Apollo nozzle is somehow having an effect. Can the nozzle conductivity have an effect on bed adhesion or is it just that I need to lower that Z axis several tads more?
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
It's hard to imagine the thermal conductivity of the nozzle could do that. Your extrusion temperature will likely be higher with a more conductive nozzle. But that usually improves adhesion.
But then, if your previous nozzle was partially clogged, it would've been extruding through a smaller orifice and the expanding flow would be pushing/rubbing against the bed more to expand to the 0.45 mm width given by the extruded volume and movement speed. That could possibly have made the adhesion better before.
Maybe someone else will have better ideas. 🙂
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
More likely is your bed has become contaminated with something (plastic residue, finger oils, etc).
Time to give it a good cleaning (Hot water & dish soap with no additives, clean papertowel to scrub and dry. Handle only by edges or with gloves afterwards. IPA or acetone ONLY to remove stubborn plastic residues that are not soluble in water)
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
Also - printing with hot materials will oxidize the PEI faster. And removing the oxide will need to be done more frequently. An acetone scrub followed up with a soap and water wash to remove the white film it leaves should get the bed back to new condition.
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
That's the strange part though: I was printing successfully on the other side of the plate for 6 months, turned if over to print on this side about a month ago and changed nozzles a few days ago, I'd be surprised if the "fresh" side had time to get so bad (with the same maintenance regime) and it seems specifically different to me when I remove the pre-print strip along the front of the heatbed: it comes away really easily now whereas it did not before I switched nozzles.
I guess I will have to give it a clean, fiddle with Z height a little more and use a glue stick until I've figured it out.
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
Well, maybe it isn't the extruded plastic heat that degrades the surface, rather the bed heat? And the unused side is where?
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
That's the strange part though: I was printing successfully on the other side of the plate for 6 months, turned if over to print on this side about a month ago and changed nozzles a few days ago, I'd be surprised if the "fresh" side had time to get so bad (with the same maintenance regime) and it seems specifically different to me when I remove the pre-print strip along the front of the heatbed: it comes away really easily now whereas it did not before I switched nozzles.
How were you removing prints on the original side? If you've been removing the sheet and flexing the spring steel, you're likely touching that underside quite a bit. It's not that "fresh" in terms of handling.
The good news is that a good dunk with Dawn should restore both sides to like-new condition. If you want more detail, I've dumped everything I know about Prusa PEI adhesion here, bed cleaning here and Live-Z calibration here.
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RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
Excellent write-ups, thank you. I never remove the print surface so the reverse side wouldn't have been handled. I will get down with Dawn and perform the "life adjust" procedure with ASA to make sure I've got it dead right. Then it _must_ work :-).
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
@bobstro: the Live-Z.stl file in the downloadable ZIP file from your Live-Z notes seems to be corrupted: at least, it crashes slic3r for me. Also it's probably worth updating the link to Jeff Jordan’s " life-adjust" procedure as I guess it's changed with these here new forums.
Edit: actually, the original STL file from the Jeff Jordan forum post also crashes slic3r...
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
@bobstro: the Live-Z.stl file in the downloadable ZIP file from your Live-Z notes seems to be corrupted: at least, it crashes slic3r for me. Also it's probably worth updating the link to Jeff Jordan’s " life-adjust" procedure as I guess it's changed with these here new forums.
Edit: actually, the original STL file from the Jeff Jordan forum post also crashes slic3r...
I'll give it a look, thanks. I need to go through and check all the forum links.
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
I downloaded the STL and loaded it into Slic3rPE 1.41 and 1.42 beta, sliced and exported the gcode without errors. I'm doing prints, but the STL looks OK so far. Can you try another slicer perhaps?
I think I hunted down and corrected all the "Life Adjust" links, thanks!
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
OK, moved to slic3r 1.42 beta2 (from beta1) and no crash occurs, will now try that calibration square...
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
FYI, Prusa suggested I need to do PID Tuning from the calibration menu after a nozzle change, which makes perfect sense. Will see if it makes a difference.
RE: Can bed-adhesion be affected by nozzle type (when the nozzle size is unchanged)?
FYI, Prusa suggested I need to do PID Tuning from the calibration menu after a nozzle change, which makes perfect sense. Will see if it makes a difference.
Did the PID tuning solve all your adhesion problems? Any more updates on your nozzle-change adventures?
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