Prusa upgraded to duet, weird extrusion

[Murloc992]

@NitroFreak said in Prusa upgraded to duet, weird extrusion:

@Veti said in Prusa upgraded to duet, weird extrusion:

@Murloc992
i dont think you are gonna reach any speed where the emf becomes a problem with the extruder.

Thats really the only option left to test why the 0.9 steppers produce that pattern.
24v PSU are not that expensive. i got my meanwell‘s used on ebay for 24€

Yeah, I mean for testing the stepper only. Because I am crap out of luck for other components.

[NitroFreak]

24v heater cartridges are not that expensive and 24v silicone heated pads are also not that expensive. the 12v fans can be driven by the 24v duet by means of a buck converter

[droftarts]

@Murloc992 As 1mm/s (I guess that’s X/Y federate?) seems to be the problem, and you’re unlikely to print at that speed normally, what happens if you print the box but set the speed multiplier to 200% or higher?

Ian

[droftarts]

Thinking about it, what you might be seeing is the effect of running the extruder so slowly, you’re seeing individual steps, and the motor has to stop between each step, which causes a lack of continuity of movement, hence the stuttering. Try setting extruder to x256 microstepping, or turn off interpolation.

Ian

[Murloc992]

So I took some oscilloscope readings at same speeds, just different stepper currents (old one at 800mA, new one at 1200mA)

Old motor retracting at 30mm/s:

New motor retracting at 30mm/s:

(seems very noisy and sharp?)

Old motor retracting at 5mm/s:

New motor retracting at 5mm/s:

[Murloc992]

@droftarts 1mm/s was my test extrusion rate, not printing.

[Murloc992]

@droftarts said in Prusa upgraded to duet, weird extrusion:

Try setting extruder to x256 microstepping, or turn off interpolation.

Nothing.

@droftarts said in Prusa upgraded to duet, weird extrusion:

what happens if you print the box but set the speed multiplier to 200% or higher?

I will try that in the morning.

[Murloc992]

@T3P3Tony Maybe you looked at my oscilloscope phase readings? Does this depict shortage of driver voltage?

[droftarts]

@Murloc992 100th post! This is surprising. Sorry, we usually get these sorted a bit quicker. I don’t know much about oscilloscope readings, so can’t help there. But hopefully someone will! We'll get it sorted!

Ian

[Murloc992]

@droftarts In fact, the faster I print, the less artifacts I get. 15mm/s perimeter speed was in the previous pictures. 30mm/s perimeters give me less artifacts, 45mm/s feels like they don't really exist, 60mm/s erases them completely.

"Just don't print small things until you have 24V"?

[DocTrucker]

@Murloc992 those are some conservative speeds. Seen a track width of 0.45 mentioned. Are you running a normal 0.4mm nozzle? Layer thickness? E3D V6 with 0.4mm nozzle passing PLA at 210-230C can do 100mm/sec at 0.25mm layers and 0.48 track width.

Big thread, excuse me if those questions have been covered.

[Murloc992]

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

@Murloc992 those are some conservative speeds. Seen a track width of 0.45 mentioned. Are you running a normal 0.4mm nozzle? Layer thickness? E3D V6 with 0.4mm nozzle passing PLA at 210-230C can do 100mm/sec at 0.25mm layers and 0.48 track width.

Big thread, excuse me if those questions have been covered.

Usually I print at 60-100mm/s using PETG. My hotend is genuine E3DV6 with 0.45 extrusion width. Right now I am experimenting with 200% speed modifier applied to my profile. The printer is literally flying and I can't see anything wrong with the print right now. 27 minute print seems to be completed in just 16.

[DocTrucker]

@Murloc992 what layer thickness are you using?

[Murloc992]

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

@Murloc992 what layer thickness are you using?

0.2, tried 0.10, 0.16 and 0.24.

I just printed a part with ABS..

and..

there's almost no extruder artifacts..??? (except for printing ABS in open air, getting drooping on overhangs, etc.)

Maybe there are some vibrations, but no apparent diagonals.. Maybe a TINY bit of irregular extrusion..

Is it the filament I use, the PETG I mean..?

What..

So lost..

[DocTrucker]

PETG can run hotter than 210 with my machine but 230C on mine may well be similar to 210C on yours. That said my part quality isn't A1 either. Assume you're running minimal part cooling on anything other than overhangs? ABS is supposed to flow better than even PLA, but it stinks and irritates my throat so not tried it on my home machines.

[Murloc992]

@DocTrucker said in Prusa upgraded to duet, weird extrusion:

PETG can run hotter than 210 with my machine but 230C on mine may well be similar to 210C on yours. That said my part quality isn't A1 either. Assume you're running minimal part cooling on anything other than overhangs? ABS is supposed to flow better than even PLA, but it stinks and irritates my throat so not tried it on my home machines.

I print PETG at 250'C as per manufacturer.

There was no sufficient cooling and I think my bed thermistor setting is crap.

90'C bed results in a 102'C reading on my FLIR.

[DocTrucker]

@Murloc992 sorry, muddled two threads into one there. 210C was from a different thread.

[Murloc992]

ABS, a bit better cooling.

So it must be filament then?