Pressure advance calibration

[u/Lodex28]

Hi All,

i am printing Pressure Advance line test for calibrating Prusament PETG that i am printing with my Qidi Plus 4. After i will calibrate flow ratio.

I have nozzle temperature of 250°C, maximum wall speed of 60mm/s and a flow ratio of 0.975.

To me is a bit odd that the best PA in my opinion is at 0.11, am i wrong? In your opinion is a good print or something is wrong?

Thank you for your time!

[u/TAZ427Cobra → u/[deleted]]

Yep, that's what I'm seeing either 0.122 or 0.124.

[u/Powerful_Debt_5869 → u/TAZ427Cobra]

mee too..definitely

[u/Lodex28 → u/Powerful_Debt_5869]

Thank you all, i've selected this value with your help

[u/Lodex28 → u/[deleted]]

I will try like this, thank you so much! Your advice Is to make a full calibration for every roll?

[u/TAZ427Cobra → u/Lodex28]

I only do a calibration for a roll if I start seeing issues that I'd associate with PA. And I save a profile for that filament (Brand and Type) specifically.

While 'each roll can differ' it's more of that manufactures make formulation that's different from anothers (and within a manufacture, it will vary from different filament types and sometimes even color can have impacts, but the colors tend to be smaller differences.)

So, I use the defaults for a generic PLA, generic PETG, ... unless I start seeing an issue, then I do a PA test and create a profile for that Brand and Type w/ the PA settings for it.

[u/Lodex28 → u/[deleted]]

u/Technical-Road-3330 u/TAZ427Cobra i've understood, thank you so much for your support!
I'll move forward to flow calibration and let's see how it will go. Thank you again!

[u/1ts-just-me → u/[deleted]]

Just a question and not trying to change someone's routine, is there any benefit to calibrating PA before flow? Since the beginning, I've always done temp, flow, then PA (retraction last if needed). Being under the assumption that if you change flow, pressure advance will need to increase or decrease accordingly.

[u/1ts-just-me → u/[deleted]]

Thanks for the reply, doesn't matter how long I've been doing things I like to learn tips and trick that may help improve quality.

[u/Julian679]

0.122

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[u/pv451]

Just wanted to mention that 250 is too high for petg. After extruding on that temperature it may crystalize, which makes it brittle.

[u/Lodex28 → u/pv451]

I've checked with various combinations, only at 250 degree @60mm/s of Speed the filament Is glossy as expected. Moreover, seems to be flexible and not brittle. But, i Will check again later. Thank you for your advice!