Horrible print results.Help needed?
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I will do that as soon as the current print is done and I will post pictures.I am printing this current print a bit colder with the slower retraction setting.
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your part cooling fan is on 100%?
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Yes it is on 100% for the PLA but there is no cooling when printing in PETG.
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Can you post one of the gcode files? That will include the cura settings as well.
Actually it would be helpful if you went to File>Save in cura and exported a .3MF file that had the whole cura and printer configuration together so we could see everything.Also post your config.g and maybe a few more details about your printer. Pictures even.
Do you have any fresh filament? The stringiness could be from moisture in the filament if it's been sitting out for a long time.
Have you PID tuned the hotend? What kind of thermistor is it using? What values are configured for it? It's possible that the temperature reported is far off from the actual temperature.
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Here is the Cura file
The filament is brand new both reels have just been opened they don't even have 24 hours worth of moisture absorption yet.
Here is the config
; Configuration file for Duet WiFi (firmware version 1.21)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Mon Nov 05 2018 12:42:23 GMT-0500 (Eastern Standard Time); General preferences
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves; Network
M550 PTony's P3 Steel ; Set machine name
M551 Pfabian7505 ; Set password
M552 S1 ; Enable network
;*** Access point is configured manually via M587
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet; Drives
M569 P0 S0 ; Drive 0 goes forwards reversed
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards reversed
M569 P3 S1 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80 Y80 Z400 E415 ; Set steps per mm
M566 X900 Y900 Z12 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 E1200 ; Set maximum speeds (mm/min)
M201 X500 Y250 Z250 E250 ; Set accelerations (mm/s^2)
M906 X1200 Y1200 Z1200 E1200 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X-25 Y0 Z0 S1 ; Set axis minima
M208 X220 Y320 Z200 S0 ; Set axis maxima; Endstops
M574 Y1 S0 ; Set active low endstops
M574 X1 S1 ; Set active high endstops
M574 Z1 S2 ; Use zprobe for zmin; Z-Probe
M307 H7 A-1 C-1 D-1 ; Disable heater on PWM channel for BLTouch
M558 P9 H7 F200 T6000 ; Set Z probe type to bltouch and the dive height + speeds
G31 P25 X24 Y0 Z3.503 ; Set Z probe trigger value, offset and trigger height
M557 X25:200 Y30:300 S40 ; Define mesh grid; Heaters
M307 H0 B0 S1.00 ; Disable bang-bang mode for the bed heater and set PWM limit
M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M143 H0 S110 ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 1
M143 H1 S290 ; Set temperature limit for heater 1 to 290C; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H0:1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H0:1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on; Tools
M563 P0 D0 H1 ; Define tool 0
G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0CM501 ; Override
; Automatic saving after power loss is not enabled
; Custom settings are not configured
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I took a look at your cura profile and config and here's what I've got.
Is your nozzle size really 0.3mm?
The extruder jerk is quite low at
M566 E120, same with acceleration atM201 E250That's going to make your retractions pretty slow and allow some oozing, which could explain some of the stringing. I would try 1200 for jerk and 2500 for acceleration.It would be nice to know what your thermistor is to know if your heater parameters are accurate since the pictures of your parts seem very overcooked. You can test your extrusion temperature by setting the hotend temp to something like 140 and trying to push the regular PLA filament through by hand. It shouldn't be able to melt very well at 140. If it does melt easily then your hotend temps may be higher than reported since PLA doesn't extrude very well until about 170c. If that's the case you can try reducing your print temps to see if it improves quality.
You may want to also try reducing the material flow % in Cura to 95%.
You may also want to disable the acceleration and jerk control in Cura for the time being as they are set very high compared to what you have in config.g and since this is such a small part you probably will need to slow down a bit. In fact, it may help to print two of these parts at the same time to give it time to cool down between layers.
You've got Z hop on retraction enabled in Cura. This will definitely add some stringing. Usually Z hop isn't needed.
Tree supports are probably unnecessary for this part. The overhangs are a little steep on the underside, but with cooling and slower external wall speed it should be alright. And the bolt holes on the top arms should bridge just fine.
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@siblues said in Horrible print results.Help needed?:
M305 P1 T100000 B4725 C0 R4700 ; Set thermistor + ADC parameters for heater 1
the B4725 would indicate that you are trying to configure a Semitec 104-GT2 but you are missing the C value. This would result in the wrong temperature. The C Value is 7.060000e-8
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I am using a .3 nozzle and I have adjusted the settings you mentioned other than the thermistor value.I am using a Semitec thermistor.I will try to print two parts so as to give them sufficient time to cool.I also turned off acceleration and jerk control in Cura and I am just slowing down the outer wall speed to 20.0 mm/s and disabling tree supports.
The thermistor value should be changed from
M305 P1 T100000 B4725 C0 R4700to
M305 P1 T100000 B4725 C7.060000e-8 -
FYI...I have gotten plenty of filaments that even though they arrived in a vacuum sealed bag with dessicant, they had moisture in them and had to be dried. Mainly PETG and definitely Nylon. Also I just received some prilon Carbon PC yesterday, perfectly vacuum sealed with dessicant and had tons of moisture.
So if it's petg I would thrown it in an oven at it's lowest possible temperature for 4-6 hours or a dehydrator at 60-65C for the same time and dry it.
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going to make a suggestion that helped me - make sure the filament size in the printer setup in cura is set to 1.75mm. I had very brittle prints and a lot of wierd issues because of this.
even though I had set the filament size in the slicer at the correct size the printer profile was set to 3mm and was overriding the filament set up.
basically gives the same effect as massive under-extrusion.
probably not this but worth checking.
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I am going to look into a dehydrator and the last time I checked it was set to 1.75 but I will make sure.
The thermistor line in config.g should it be written like my second example?
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@siblues said in Horrible print results.Help needed?:
The thermistor line in config.g should it be written like my second example?
Yes, you can leave off the R value and the Duet will use the default, which is fine.
As for the moisture, usually you can hear some hissing and popping or bubbling as you extrude into free air if it's really bad.
I don't know where you live, but if there is high humidity it's more likely to be an issue.
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I live in NJ also known as the armpit of America.I don't hear any hissing or popping which isn't definitive proof of dry filament.I tried lowering the temp to 210 before making all of the adjustments mentioned in this thread and there was much less stringing with the Esun PLA+ so maybe with the adjustments and some temp tuning I will get better results.
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I'm in NJ as well...I thought it was petg you were printing....I've never really had a moisture issue with PLA+. I used to use Esun but wasn't a fan and switched to Sunlu PLA+. Now for PETG I primarily use Esun.
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Nice to know there are more of us on here.
I am using a few different brands like Esun,Inland,Amazon,Sainsmart and Fox filament.I have used quite a few rolls of every brand except the Esun stuff.Inland always seems to work well for me so I always have a few spools laying around.I am having similar issues with both PETG and PLA+.I may try using a PT100 for more precise temperature control and just to make sure the readings are actually what they say they are.
I'll post up some pics of the two parts I am currently printing for some more advice.
Here are the two pieces I just finished with the new settings and printed at 210 degrees.I printed them at .2 layer height and the layers are really noticeable'I would love to get a smoother finish if possible.This is for a new fan set up so that it can be used with my standard V6 and my Volcano that's in the mail.I think one of the issues is the part isn't getting a strong stream of air from the cooling fan the way it is right now.
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@siblues said in Horrible print results.Help needed?:
I'll post up some pics of the two parts I am currently printing for some more advice.
The first one in particular looks to me that is was printed way to hot and/or with insufficient print cooling. Suggestions:
- Check your M305 thermistor settings. Your second example is correct if you are using an E3D thermistor.
- Try a lower temperature. Most PLA filaments print OK at 190 to 200C.
- Try a higher print cooling fan setting.
- Tall thin towers like those are often a problem because each layer doesn't have time to cool before the next one is printed. Most slicers have a "minimum layer time" to help with that. Try increasing that setting.
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I didn't see that you'd edited your post with your results. I don't think the forum sends a notification on an edit, nor does it show up as an unread post, so I totally missed it.
Those pictures look much better than the first ones, so I think you're on the right track.
Now that you have the correct thermistor values, you should rerun a PID tune on your hotend heater. https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control#Section_Setting_the_model_parameters_by_auto_tuning
Then I think it would be a good idea to retune your e steps. Choose a temp you'd normally be printing at, like 210c. Mark your filament at 110mm above where the filament enters the extruder. Use
G1 E100 F60to slowly extrude 100mm of filament. When it's done, measure the distance from your mark to the extruder body, and useold_e_steps * (100 / (110 - distance_to_mark))to find your new e steps value. You may need to redo this a few times to get it dialed in.Lastly, you'll want to calibrate your filament flow value for the slicer to fine tune your flow rate. Usually this is done by printing a small single wall object to get your extrusion width right. Something like this: 0_1555018807413_100mm rounded.stl
Print it in vase mode or spiralize contour mode in Cura. Set your extrusion width to match your nozzle size and print at something like 30mm/s. For your 0.3 nozzle a layer height of 0.15 would be ideal. Set the flow rate in Cura to 100%. Then once it's printed use a caliper to measure the wall thickness at the top middle of all four walls, take the average thickness and use
Old Flow Rate * (Expected Thickness/Measured Thickness) = New Flow Rate.. You may need to redo this a few times to get it dialed in.Another good way to tune the flow rate is to print a large square (same STL as above) and watch the solid infill lines. If your first layer height is accurate, you should be able to use the extrusion multiplier slider in the DWC or PanelDue to adjust your line thickness until you're getting a nice first layer. Take the resulting percentage you set on the slider and use the same formula as above to find your new flow rate.
Another good way is to print that same STL with zero infill, zero top and bottom layers and 2 perimeters. Use the same speed for inner and outer walls. Extrusion width same as the nozzle for both. Layer height 50% of nozzle width. Use a brim to keep it anchored. This works best when you're already close to having the right flow. Let it print several layers and watch the two walls reduce the extrusion multiplier until you can see a gap between the walls then slowly bring it back up until the gap is gone.
You can use the same method to adjust your print speed by adjusting the print speed up or down with the speed slider until things are starting to look smooth. Then using the resulting percentage to scale the values you used in the slicer.
That same STL can work well to dial in your first layer height once the flow rate is distilled in too. Baby step until it's putting down perfect layers and adjust the z probe offset accordingly.
Once you've got the temps and extrusion rate nailed down I think you'll notice a big improvement in print quality.
A good way to help with the part cooling for such small parts is to use no heated bed at all if you can get away with it. Pointing a small fan in the general direction of the parts on the bed can help a lot too.
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I tried everything you mentioned above Phaedrux and the prints look much much better but there is definitely some room for major improvement.I am currrently printing at 200 degrees.This is my first PLA+ roll so I am not really sure if 200 is good but I am going to print a few test cubes at different temps to see which one gives me the best results.I printed an empty cube with a .3 wall thickness in spiralize mode and the results where amazing.I will print another and post results.
Here is the last print
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Still looks over extruded and maybe still too hot. Try 195c and reduce the flow rate 5 percent.
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I had already started another print at 190 so I will post those results when they are done printing.The parts pictured above are really strong and have almost eliminated the crazy amount of stringing so the results are headed in the right direction.I raised the minimum layer time from the 5 second Cura default to 10 seconds.I don't know if that should be adjusted a bit higher?
