.6 Nozzle PETG problems
I've printed this fine with the .4 nozzle at .2 resolution but wanted to try out the .6 brass nozzle at .32 resolution for some time savings. The print is very close to 100% infill. I can't finish a print with the .6 nozzle. I'll get a blob eventually that crashes the print. Zyltech Black PETG. I've calibrated extrusion multiplier to 1.05, 30mm Max print speed, 8 mvs, with extrusion width .72. 230/240 temp
It seems on the upper rounded area, it starts to create ridges on the infill and I'm not sure if that's when the nozzle starts collecting material or not but it's crashed close to this height 3 times.
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RE: .6 Nozzle PETG problems
I find that PrusaSlicer tends to over-extrude with thicker layer heights. At heights > 0.32mm, I drop the extrusion rate 10% using this line in startup gcode:
M221 S{if layer_height >= 0.32}90{else}100{endif} ; compensate for thick layer heights
Note that the Prusa profiles do something similar on lower layer heights. Quick fix would be to simply knock back your extrusion multiplier under filament settings. 1.05 seems very high for most PETGs I've worked with.
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RE: .6 Nozzle PETG problems
@bobstro
I've been using your start and end code from "Last updated 20191117" so that is in there. I will try lowering the multiplier and see how that goes. For the test result on your page, what makes you pick the .32mm size instead of the .3mm and width of .72 across all heights on the .6 nozzle?
Also is it necessary to run calibrations on all heights I plan on using or if I dial it in at the .2 height it should be fine for the rest? Thanks!!
RE: .6 Nozzle PETG problems
[...] For the test result on your page, what makes you pick the .32mm size instead of the .3mm and width of .72 across all heights on the .6 nozzle?
I picked layer heights that correspond to 80% -- the recommended maximum layer height -- for each nozzle height profile. So 0.32mm layer heights for 0.4mm nozzles, 0.4mm layer heights for 0.5mm nozzles and so on. These values just so happen to correspond to the 0.4mm "magic multiplier" associated with stepper increments on many inexpensive printers, but that's not the reason for my height selections.
Also is it necessary to run calibrations on all heights I plan on using or if I dial it in at the .2 height it should be fine for the rest?
Normally, I do a Live-Z calibration when I change a nozzle (since the height might vary) and calibrate my extrusion multiplier for new filament types, but that's it. No need to recalibrate when simply changing settings.
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He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan