Z artifact that's time/speed related
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Is your Z axis skipping steps or binding occasionally and failing to drop the bed?
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nothing seem out of the ordinary on the machine. it all seems to be working fine
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@screwyluie Classic M584 error! M584 needs to be BEFORE all the motor settings. See https://duet3d.dozuki.com/Wiki/Gcode#Section_M584_Set_drive_mapping
Order dependence
M584 must come earlier in config.g than any M350 and M906 commands. If it creates new axes, it must also be earlier than any M92, M201, M203, M208, M350, M566, M574 , M667 and M669 commands.If it's after, it means that it's using standard settings for the second Z motor, on driver 4. Move your "Motor remapping for dual Z" section (with M584 command) up the config.g to before the "Drives" section. And don't worry, we've all done made this mistake, and now it's one of the first things I check!
Edit: Also, no point setting parameters for each Z motor in M350, M92, M566, M203, M201 and M906. RepRapFirmware does not support individual motor settings where an axis has multiple motors connected to different stepper drivers. The first parameter specified will be used for all motors on the axis. You should use identical motors on any axis that has more than one motor to avoid unexpected behaviour. You can set these individually for each extruder axis, however.
Ian
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thank you for that, sounds like it could be the issue I will give it a shot when I get a chance
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well I changed that and it didn't help. Thanks anyway though.
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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.
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Is your slicer modifying print speed or cooling based on predicted layer time?
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@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
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@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.
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did you pid tune the hotend? temperature fluctuations might cause exactly that
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@screwyluie said in Z artifact that's time/speed related:
it's an e3dv6 hotend and the standard thermistor for it.
Then your thermistor settings should be for Semitec 104, not the Honeywell. This can cause a significant difference at high temperature. I don’t have numbers/settings to hand, on phone, but they are in the firmware configuration tool.
Ian
Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth
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@droftarts said in Z artifact that's time/speed related:
@screwyluie said in Z artifact that's time/speed related:
it's an e3dv6 hotend and the standard thermistor for it.
Then your thermistor settings should be for Semitec 104, not the Honeywell. This can cause a significant difference at high temperature. I don’t have numbers/settings to hand, on phone, but they are in the firmware configuration tool.
Ian
The wrong thermistor values would not cause variation in temperature however. once the temp is tuned, it should stay the same and not cause a variation. It is literally only the number on the display that is wrong.
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@NitroFreak depends if he’s using the wrong display temperature to set the temperature! If it says 200 but is really 230C, it would cause regular filament vomiting like this. Hard to tell with a vase print if extrusion temperature is too high, as no moves that cause stringing. I’m looking at the print picture and it looks glossy and floppy, which says too hot extrusion to me.
@screwyluie have you got any other prints you’ve done, to compare?
Ian
Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth
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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.
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@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.
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@screwyluie said in Z artifact that's time/speed related:
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.
Your config looked ok. I'm inclined to think it's mechanical. I would start with disassembling the Z axis, checking things over, and reassembling.
The pattern on the vase looks like something is slipping/binding every few layers. Maybe a loose coupler? Tight lead screw nut?
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@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
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I notice in your config that the M307 line is commented out. Is your bed set to bang bang mode? This can lead to some bed warp that can cause fat layers like this.
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@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.
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If you send M307 H0 in the console, what does it reply back with?
