@droftarts said in Z artifact that's time/speed related:
I’d suspect an under-performing PSU
I will test the psu to see if that's the issue, but i think on paper it should be fine:
24V 16.7A 400W LED Driver Switching Power Supply （SMPS）110/220VAC-DC24V Transformer CCTV Monitoring power supply Industrial Power from MEISHILE
is what I have on hand. I don't have a screen or anything extra on the machine just the duet, e3d v6, bed, and motors.
@Phaedrux said in Z artifact that's time/speed related:
As I suspected you're using bang Bang mode for the bed. I suggest changing to PID mode and do an auto tune of the bed heater. This can help eliminate changes in the bed shape due to the heater which can cause issues as you're describing. Worth a try.
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control
so as a quick test of the theory I just disabled the bed heater and put down some glue instead and what do ya know.. it worked. Now read that link you sent and figure out how to setup PID and hope it doesn't do the same thing. I can't thank you guys enough for the patience and help provided.
@Phaedrux said in Z artifact that's time/speed related:
If you send M307 H0 in the console, what does it reply back with?
M307 H0
Heater 0 model: gain 90.0, time constant 700.0, dead time 10.0, max PWM 1.00, calibration voltage 0.0, mode bang-bang, inverted no, frequency default
I have tried so many things and so far nothing has had any effect on this... I've gone over and replaced basically all the hardware that could affect it except the duet... I'm wondering if I should get a different board and swap it out to see if that fixes it
@Phaedrux said in Z artifact that's time/speed related:
M307 line is commented out
honestly no idea. I do know that it heats up like it should and the temp is very steady.
@Phaedrux except that it's not layer specific, it's time based. if I speed up the print they get further apart, and likewise if I slow it down they get closer together... so it's not your typical z banding
@droftarts ok after a long hiatus, working on it again... I have adjusted the thermistor settings, didn't fix it.
@NitroFreak I did not pid tune it but it's rock solid at +-0.1
I have tried modify stuff in the slicer, even tried several other slicers all with similar results. At this point I'm pretty convinced it's either mechanical or something in the duet config I've screwed up... but I have no idea where to start.
sorry with the holidays this has been on the backburner. I will be getting back to this soon. I appreciate the help, just wanted to update.
@zapta said in Z artifact that's time/speed related:
I tried a nimble extruder a few months ago and had similar diagonal lines, never seen it before with any other extruder. I thought that they may correlate with the turn of the flex cable but gave up and went to a BMG direct extruder which works just great. No more bowdens or flex cables for me.
I have a completely different extruder on here previously with the same result, so it's not that. But thanks.
@bot said in Z artifact that's time/speed related:
Is your slicer modifying print speed or cooling based on predicted layer time?
most likely it is, I can look into that and see if it has any effect, thanks.
@droftarts said in Z artifact that's time/speed related:
@screwyluie said in Z artifact that's time/speed related:
well I changed that and it didn't help. Thanks anyway though.
Interesting. Can you post your current config?
You are using the default thermistor settings B4138, which is likely not to be correct, so you might also be extruding too hot. The print possibly looks a bit overheated. With a slow extrusion of vase mode, there may be a build up of molten filament. In vase mode, when extrusion speed is consistent, this would release at regular intervals. What thermistor do you actually have?
Otherwise, the frequency could relate to an eccentrically turning extruder drive. What drive are you using? Bowden or direct? Try extruding 50mm slowly into air, see if the extrusion is consistent, also if the feed into the drive is consistent.
Does the filament have a consistent bulge in it?
Ian
it's an e3dv6 hotend and the standard thermistor for it.
as for the extruder drive, I've completely replaced the entire extruder, so I really don't think it's the extruder. I'm currently using a nimble, I had a direct drive on previously... so entirely different hardware.
I've used half a dozen different filaments in this process, so it's not that either.
current config is the same as before except I moved the M584 command above the M350 command as instructed previously.
well I changed that and it didn't help. Thanks anyway though.
thank you for that, sounds like it could be the issue I will give it a shot when I get a chance