Pressure advance issues
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I have inserted M572 P3 S0.1 into my startup of each print and have not found it to do anything. I have seen this referenced other places as D0 instead of P3, when changing it to D0, I get some odd banging around noises, but not what I would expect. This is a single extruder setup on a Duet Wifi with 1.17 firmware.
Charles
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You need D0 in the M572 command, not P3. Try reducing the amount of pressure advance to 0.05, or reduce the allowed extruder j**k in the M566 command.
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When M572 was introduced in the firmware and published config I removed it, along with a few others, due to print/build issues.
Having read this article i re-introduced it and reduced the retraction amount as suggested.
I simply cannot believe the difference this has made to the quality of my prints; and the faster speeds possible.
Why do we keep this function such a big secret?I'm using Matter Hackers slicing software;
an Ultimate Greg's Wade's Geared Extruder;
and a Volcano type hot end 0.6 mm nozzle.
Firmware 1.17 -
Is pressure advance compatible with absolute extrusion mode? Thanks.
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Hi Merlin, it's not a secret! Just variable requirements and a wide range of hardware makes it more or less applicable to people.
What printer are you using (Bowden? Length?).
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Is pressure advance compatible with absolute extrusion mode? Thanks.
Yes it is. The only feature I am aware of that has issues with absolute extrusion is pause/resume when used with mixing hot ends and mixing is enabled.
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Printer is a cross between dc42 "Big Delta" design and T3P3 XL Delta. Duet Wifi.
24V 0.9 deg stepper motors; all metal construction.
Bowden tube is 53cm ; Extruder motor is 1.8 deg from my old Ormerod 2. -
Printer is a cross between dc42 "Big Delta" design and T3P3 XL Delta. Duet Wifi.
24V 0.9 deg stepper motors; all metal construction.
Bowden tube is 53cm ; Extruder motor is 1.8 deg from my old Ormerod 2.I have a similar machine. How much pressure advance and retraction are you using? Thanks!
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M572 D0 S0.1
5mm retraction defined in MatterHacker, not using firmware retraction as MH slicing software does not support it.[Worth looking at latest version of Matter Hacker - its an interface and a slicer, with great 3D graphics a bit like Simplify3D; it's a free download and has a neat recovery feature, except this feature only works when driving printer from MH via usb]
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Further to my earlier posts on this subject:
I see that Matter Hackers slicer does support firmware retraction but cannot hack complex multi colour slicing - very slow, plus limit of 300,000 polygons!
So I have now gone back to S3D - the latest version makes mincemeat of multi colour slicing and is extremely fast.
Well worth the money as far as I am concerned (but not telling 'her indoors'). -
I tried 0.1 and 0.15 pressure advance on my delta (600+ mm bowden tube), but I can't see any difference in print quality compared to before. The only difference I notice is that my extruder makes odd sounds while printing the skirt.
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Does Pressure Advance slow down your printspeed considerably? It's the only variable I've changed, and I seem to have lost the ability to actually control the speed…a 20min test cube turns into a 1.5hr test cube, and adjsuting the speed factor seems to do nothing..
Thoughts?
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SCRATCH THAT, I was implementing it in the config.g, works in the starting gcode just fine
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I found that I needed to increase the acceleration and j**k values when I started to use pressure advance, otherwise the printing speed was reduced.
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I found that I needed to increase the acceleration and j**k values when I started to use pressure advance, otherwise the printing speed was reduced.
The extruder j**k value is the critical one. The extruder acceleration during printing moves is limited to the lower of the value you specified in M201, and the j**k converted to mm/sec and divided by the amount of pressure advance.
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I found that I needed to increase the acceleration and j**k values when I started to use pressure advance, otherwise the printing speed was reduced.
The extruder j**k value is the critical one. The extruder acceleration during printing moves is limited to the lower of the value you specified in M201, and the j**k converted to mm/sec and divided by the amount of pressure advance.
M201 X1000 Y1000 Z15 E1000 ; Accelerations (mm/s^2)
M203 X15000 Y15000 Z300 E3600 ; Maximum speeds (mm/min)
M566 X600 Y600 Z30 E200 ; Maximum j**k speeds mm/minuteOkay, so… If M201 is E1000 and M566 is E200 (mm/m) I'd be limited at the 1000mm/s on acceleration?
If i take 200 / 60 and divide that by .1(pressure advance) I get 33.3mm/s
Am i doing that right? Should I adjust any of that? o.O;
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That's all correct. You don't need very high extruder acceleration for printing moves (and pressure advance doesn't affect the acceleration for retract and un-retract moves); however 200mm/min extruder j**k is unusually low, so the associated acceleration limit for printing moves that it causes might have an effect.
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That's all correct. You don't need very high extruder acceleration for printing moves (and pressure advance doesn't affect the acceleration for retract and un-retract moves); however 200mm/min extruder j**k is unusually low, so the associated acceleration limit for printing moves that it causes might have an effect.
Okay! Glad to hear! I believe I even upped that from where it was before… wondering if this might be the cause of my issues haha
What E-J**k settings would you recommend? Using a e3d Titan with pancake stepper..
Thanks,
-Casey -
I'm experimenting with some pressure issues here too. Stumbled on this thread, with adding M572 D0 S0.2 (I have an unusually long bowden tube) things seem much better- still tinkering. What are we actually changing with pressure advance?
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I've just added wiki page https://duet3d.com/wiki/Pressure_advance#How_to_enable_and_configure_pressure_advance.