Thanks Greg. I wonder if the nozzle needs replacing.
GregValiant 1,455
It could be. A nozzle's ID will wear and become over-sized over time (some material are worse than others) it shouldn't leave a pattern that comes and goes like that.
Regarding nozzles, I have noticed that some nozzles produce a "roostertail" effect at higher speeds and that causes material to collect on the outside of the nozzle. After it builds up to critical mass it comes off in droplets on the model and is highly annoying. So not all nozzles are created equal.
Back to the pattern, for right now I'm sticking with "It's a bed thing". Nothing else I've thought of really fits what we see.
Edited by GregValiantSo it's not the bed. I reprinted the same gcode file that produced the good resulting part in the pic above, and it printed fine. When I reslice that part file with my current profile, I get the mess shown above. I may have modified the profile from good part to bad part, but I don't know what changes may have been made. Am I correct in assuming there is no way to identify all the parameters of the profile simply from the gcode file?
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GregValiant 1,455
This isn't helpful, but I've gotten that pattern occasionally and never figured out why it occurred. My thought was that clean or not, it's related to the build surface rather than anything else. You can see the pattern from above before the second layer goes on. The pattern never appears on layers above the first layer either. It's also too regular to be related to the filament (moisture) or oddities of the extruder.
The one thing in common here is that I print on glass and use hair spray for bed adhesion. Go figure.
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