Starting over with config.g



  • I built my DIY CoreXY about 8 months ago and over the span of the first 4 months I tuned and tweaked this and that until it was producing some beautiful prints.
    I was specifically proud of how it printed PETG with hardly any blobs or stringing and I could ramp the speed pretty high with excellent results.
    I was doing all of this on 1.19.2 beta.

    Life was good, until…

    This past Saturday I thought I would show my Duet Wifi a little love with a firmware upgrade.
    As I was attempting to install 1.20, when it rebooted but it never booted back up.
    No wifi connection, nor could I connect using usb even though I could still the printer in my device manager.
    I tried re-configuring using Pronterface but still no joy. Even though it would connect every command I tried to send ended with an error message.
    So I did a hard reset, then went through the steps of SamBa, Pronterface, etc. until I had a fresh copy of 1.20 installed and everything was working properly.
    One thing I did that I regret with a passion is like an idiot I formatted the Duet's SD card so I would have a completely fresh install, not thinking about the settings in the config.g being lost.

    So I configured new settings using the RepRap configuration wizard and tried to change what settings I could remember back to what they were before.
    But I am not confident that I have them even close.

    My beloved printer prints like crapola now. I still have the same roll of PETG that was producing perfect prints before the outage but now even at 35mm/s it under-extrudes horribly. The feeder pops like it's going to explode and filament gums up to the point I can't past the 2nd layer before I abort the print.
    I have changed the nozzle and other things that I know might would cause under extrusion but that didn't work either.

    I am positive it is the settings in config.g and I have something our of wack.
    Could I trouble any of you gents with a better understanding of this gcode language and give me an idea of what I am doing wrong?
    I would forever be indebted if I could just get back to a reasonable starting point.
    Is it my settings or should I go back to 1.19.2?

    I haven't tried anything other than PETG. I have a roll pf PLA but I was hoping I wouldn't have to go to that trouble since just putting on a new nozzle and I am in the middle of a little project I have going on.

    BTW, I stopped using pressure advance months ago as I could never get it set right, and it ended up printing beautifully without it.
    I am all for enabling again if anyone could tell me how to troubleshoot it properly.

    Here are my settings:

    [[language]]
    ; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Sun Feb 18 2018 15:59:49 GMT-0600 (Central Standard Time)
    
    ; General preferences
    M111 S0                                       ; Debugging off
    G21                                           ; Work in millimetres
    G90                                           ; Send absolute coordinates...
    M83                                           ; ...but relative extruder moves
    M555 P2                                       ; Set firmware compatibility to look like Marlin
    ; Automatic saving after power loss is not enabled
    
    M667 S1                                       ; Select CoreXY mode
    M208 X0 Y0 Z0 S1                              ; Set axis minima
    M208 X300 Y300 Z300 S0                        ; Set axis maxima
    
    ; Endstops
    M574 X1 Y1 S1                                 ; Set active high endstops
    M574 Z1 S2                                    ; Set endstops controlled by probe
    M558 P1 H5 F120 T6000                         ; Set Z probe type to modulated and the dive height + speeds
    G31 P500 X0 Y0 Z.72                           ; Set Z probe trigger value, offset and trigger height
    M557 X13:265 Y0:249 S83                       ; Define mesh grid
    
    ; Drives
    M569 P0 S0                                    ; Drive 0 goes backwards
    M569 P1 S0                                    ; Drive 1 goes backwards
    M569 P2 S0                                    ; Drive 2 goes backwards
    M569 P3 S0                                    ; Drive 3 goes backwards
    M350 X16 Y16 Z16 E16 I1                       ; Configure microstepping with interpolation
    M92 X99.5 Y99.5 Z399.7 E96                    ; Set steps per mm
    M566 X1500 Y1500 Z300 E3600                   ; Set maximum instantaneous speed changes (Jerk)(mm/min)
    M203 X12000 Y12000 Z375 E9000                 ; Set maximum speeds (mm/min)
    M201 X1800 Y1800 Z300 E1800                   ; 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
    
    ; Heaters
    M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30     ; Use PID on bed heater (may require further tuning)
    M305 P0 T100000 B4138 C0 R4700                ; Set thermistor + ADC parameters for heater 0
    M143 H0 S120                                  ; Set temperature limit for heater 0 to 120C
    M305 P1 T100000 B4138 C0 R4700                ; Set thermistor + ADC parameters for heater 1
    M143 H1 S280                                  ; Set temperature limit for heater 1 to 280C
    
    ; 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 0C
    
    ; Network
    M550 PHypercube                               ; Set machine name
    M552 S1                                       ; Enable network
    M587 S"FBI SURVEILLANCE STREAM" P"73636F7474" ; Configure access point. You can delete this line once connected
    M586 P0 S1                                    ; Enable HTTP
    M586 P1 S0                                    ; Disable FTP
    M586 P2 S0                                    ; Disable Telnet
    
    ; Fans
    M106 P0 S0 I0 F500 H-1                        ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
    M106 P1 S1 I0 F500 H1 T45                     ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
    M106 P2 S1 I0 F500 H1 T45                     ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on
    
    ; Custom settings are not configured
    
    


  • I wanted to add a picture of the very last thing I printed in PETG before the outage.
    I was very proud of how well it printed and I desperately want to get it back to this point.



  • Your steps per mm look weird

    M92 X99.5 Y99.5 Z399.7 E96 ; Set steps per mm

    You might want to use the calculator in the configurator to get those set properly. You'll need to know your motor degrees and the lead screw and pulley details for your hypercube.

    That's a good cautionary tale. Always make a backup.

    I don't know if it would help, but if you wanted I could post my config for my DBot CoreXY, which is similar to the HyperCube just for comparison.



  • @Phaedrux:

    Your steps per mm look weird

    M92 X99.5 Y99.5 Z399.7 E96 ; Set steps per mm

    You might want to use the calculator in the configurator to get those set properly. You'll need to know your motor degrees and the lead screw and pulley details for your hypercube.

    The configuration tool actually set these at X100 Y100 Z500 E100
    I put a ruler to it and measured the distances to the milimeter, and adjusted the steps until I was dead on accurate.

    I put what I thought was the correct information in the configuration tool but it wasn't dead on like it is now.
    As a matter of fact, 500 steps for the z axis moved almost 200mm vs the 100mm I input to it.
    399.7 is dead on the money.



  • Next I'd be looking at doing an e steps calibration.

    Then a PID tune for the hot end and bed.

    Then experimenting with speeds

    M566 X1500 Y1500 Z300 E3600 ; Set maximum instantaneous speed changes (Jerk)(mm/min)
    M203 X12000 Y12000 Z375 E9000 ; Set maximum speeds (mm/min)
    M201 X1800 Y1800 Z300 E1800 ; Set accelerations (mm/s^2)

    Seems to be on the high end for a Core XY imo. You can also set separate travel and print max speeds.



  • And that is my problem.
    I worried that they were way off, and the configuration tool is an excellent starting point but it doesn't set the printer up perfectly out of the box. Hence all of the adjustments I made over the months.

    I read that the maximum speed setting won't matter much because you set the print speed in the slicer.
    So I set it high so I knew I was never hitting that threshold.
    I guess 12000 is pretty high. I will set it for 6000 which is 100mm/s. I print at 85mm/s at times so that will still give me some overhead.

    What should the jerk and acceleration be? I had brought the jerk down when I first installed it because I knew immediately I had it too high because the printer was really hammering even at slow speeds.
    1500 seems reasonable to me.
    I have no clue what to set the acceleration to.

    I will do PID tune tomorrow. And as I mentioned, I have already done a step calibration. Unless I am misunderstanding you and you mean something else.



  • It's fixed.

    I rolled back to 1.19.2 and i am currently printing a test cube at 85mm/s and it's much better.
    The extruder isn't popping and the doing great.

    It's not back 100% because the corners of the cube are look a little funky.
    I think it's actually over extruding a little. But I can't imagine why.
    It hit me as I typed this I changed the multiplier in my slicer chasing problems over the weekend.
    I bumped it back down. Hopefully that'll fix it.
    I lowered the jerk and acceleration down a little too.

    Hopefully this is luck and the next print will not bomb.
    But this is light years difference than the several failed attempts I have had the last 2 days.

    One thing I am noticing is that mesh leveling doesn't seem to be working.
    I always put my fingers on the lead rods and feel them change during a print.
    But I did get my bed extra darn level. I might have nailed it and they don't need to compensate.

    I'll report back.

    Thanks Phaedrux for the input.
    Much appreciated.



  • Glad you got it back in working order. I've been in the same boat chasing print settings. Eventually I have to force myself to go back to basics and start with a more methodical approach. Not changing too many things at once, and resetting the things I've probably wonked up along the way.

    I pulled my config off the duet in case you'd like to compare.

    [c]; Configuration file for Duet WiFi (firmware version 1.20 or newer)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool on Wed Feb 07 2018 13:21:45 GMT-0600 (CST)
    ; Modified for use during commissioning and further tuning
    ; First successful test print Tuesday, February 13th in the wee hours of the morning.

    ; 0 - INDEX
    ; 1 - GENERAL PREFERENCES
    ; 2 - NETWORK
    ; 3 - ENDSTOPS
    ; 4 - DRIVES
    ; 5 - SPEEDS
    ; 6 - HEATERS
    ; 7 - TOOLS
    ; 8 - FANS
    ; 9 - RETRACTION SETTINGS
    ; 10 - PRESSURE ADVANCE
    ; 11 - MISCELANEOUS

    ; 1 - GENERAL PREFERENCES

    M111 S0 ; Debugging off
    G21 ; Work in millimetres
    G90 ; Send absolute coordinates…
    M83 ; ...but relative extruder moves
    M555 P2 ; Set firmware compatibility to look like Marlin
    M911 S22 R23 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Configure automatic saving on power loss
    M912 P0 S-18.2 ; MCU temperature sensor calibration offset (M112 to view current temp. Should match room temp.)

    M667 S1 ; Select CoreXY mode
    M208 X0 Y0 Z0 S1 ; Set axis minima
    M208 X295 Y285 Z300 S0 ; Set axis maxima

    ; 2 - NETWORK

    M550 PZ-BOT ; Set machine name
    M551 Preprap ; Set password. Use reprap for no password prompt.
    M552 S1 ; Enable network
    M586 P0 S1 ; Enable HTTP
    M586 P1 S1 ; Enable FTP
    M586 P2 S0 ; Disable Telnet

    ; 3 - ENDSTOPS

    M574 X1 Y2 Z1 S0 ; Set active-low switches, low end endstop for X and Z, high end endstop for Y
    M558 P0 H5 F120 T1000 ; Disable Z probe but set dive height, probe speed and travel speed
    M557 X15:280 Y15:270 S20 ; Define mesh grid

    ; 4 - DRIVES

    M569 P0 S0 ; Drive 0 (x) goes backwards
    M569 P1 S0 ; Drive 1 (y) goes backwards
    M569 P2 S0 ; Drive 2 (z) goes backwards
    M569 P3 S1 ; Drive 3 (e) goes forwards
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X200 Y200 Z3200 E837 ; Set steps per mm
    M906 X900 Y900 Z1200 E800 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; 5 - SPEEDS

    M566 X800 Y800 Z20 E220 ; Set maximum instantaneous speed changes (mm/min)
    M203 X8000 Y8000 Z600 E1200 ; Set maximum speeds (mm/min)
    M201 X2000 Y2000 Z100 E1200 ; Set maximum accelerations (mm/s^2)
    M204 P1000 T2000 ; Set printing and travel accelerations

    ; FEEDRATE CONVERSIONS
    ; 20mm/s = F1200
    ; 70mm/s = F4200
    ; 120mm/s = F7200

    ; 6 - HEATERS

    M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (Auto-tune settings are in config-override)
    M305 P0 T100000 B3950 C0 R4700 ; Set thermistor + ADC parameters for heater 0 (Bed)
    M143 H0 S135 ; Set temperature limit for heater 0 (Bed) to 135C
    M307 H0 F1 ; Set PWM frequency for heater 0 (Bed) to 1Hz to prevent lights flickering
    M305 P1 X200 ; Remap P1 to PT100 channel 200 (Hotend)
    M143 H1 S280 ; Set temperature limit for heater 1 (Hotend) to 280C

    ; 7 - TOOLS

    M563 P0 S"Titan Aero" D0 H1 ; Define tool 0 (Titan Aero extruder)
    G10 P0 X0 Y0 Z0 ; Set tool 0 axis offsets
    G10 P0 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C

    ; 8 - FANS

    M106 P0 S0 H-1 ; Set fan 0 (Part cooling blower) G-code controlled. Thermostatic control is turned off
    M106 P1 S1 H1 T45 ; Set fan 1 (Hotend fan) Thermostatic control. Turns on when hotend reaches 45c
    ;M106 P2 F12 L0.8 B5 H0:1 T45:170 ; Set fan 2 (Duet case fan) Thermostatic control. Turns on 170c (basically while printing)

    M106 P2 F12 L0.8 B5 T45:65 H100:101:102 ; Set fan 2 Duet case fan. Turns on when the MCU temperature (virtual heater 100)
    ; reaches 45C and reaches full speed when the MCU temperature reaches 65C or if any TMC2660
    ; drivers (virtual heaters 101 and 102) report that they are over-temperature
    ; Minimum speed 80%, PWM frequency 12

    ; 9 - RETRACTION SETTINGS

    M207 S1 R0.01 F5000 T1200

    ; M207: Set retract length
    ; Parameters
    ; Snnn positive length to retract, in mm
    ; Rnnn positive or negative additional length to un-retract, in mm, default zero
    ; Fnnn retraction feedrate, in mm/min
    ; Tnnn feedrate for un-retraction if different from retraction, mm/min (RepRapFirmware 1.16 and later only)
    ; Znnn additional zlift/hop
    ; Example: M207 S4.0 F2400 Z0.075

    ; FEEDRATE CONVERSIONS
    ; 20mm/s = F1200
    ; 70mm/s = F4200
    ; 120mm/s = F7200

    ; 10 - PRESSURE ADVANCE

    M572 D0 S0.05 ; set extruder 0 pressure advance to 0.05 seconds

    ; 11 - MISCELANEOUS
    M501 ; Load saved parameters from non-volatile memory
    T0 ; Select first tool[/c]



  • Thank you Phaedrux.

    As I mentioned in my last post things are close to normal again, but I am still having one problem that doesn't make sense.

    Test cubes and other small things print beautifully. But when I resumed my project I mentioned earlier I am experiencing failed prints due to layer adhesion. But it's not everywhere, just on the parts of the prints with thin sections.
    As mentioned, I use PETG and before my outage everything was fine. I had printed this piece before with no issues.
    Everything looks good now, as I don't get the usual blobs, and stringing is minimal as is characteristic for PETG when things are set right.
    But when going from a large area of a model to a small, thin area I am experiencing some pretty serious delamination of the layers.
    I don't have an actual picture of the failed print as I got pissed and chunked it in the garbage but I will post a screen grab of the cad image:

    The areas between the red lines is where the delamination begins and ends. So badly that just a very light amount of pressure and the will break off in your hand.
    The yellow lines denote that area is 2.5mm thick, so as to get a reference of how thin the wall is. Not that thick to cause such a serious failure.

    Before I was successfully printing PETG at around 60mm/s, Hotend at 240c, and 25% cooling fan. With these settings after the outage I get the delamination problem.
    I have since increased the extrusion multiplier from the original .90 to .95, and finally back to 1.00, thinking it was not extruding enough filament.
    I re-enabled pressure advance and currently have it set to .03
    I even tried a print last night of 35mm/s, no fan at all, and bumped up the temp to 255c but I get the same results.

    EDIT: I forgot to mention I performed a PID tune on the extruder.

    I know it's something simple I am overlooking. But I am stumped since the obvious things have no effect.



  • I was looking over your configuration and I saw something I haven't seen yet.

    [[language]]
    M204 P1000 T2000                    ; Set printing and travel accelerations
    
    

    I checked on 'M204' and it said it sets starting acceleration.
    Can you explain?



  • Where did you see setting starting acceleration?

    Here's the Duet GCode definition. https://duet3d.dozuki.com/Wiki/Gcode#Section_M204_Set_printing_and_travel_accelerations

    M201 X2000 Y2000 Z100 E1200 ; Set maximum accelerations (mm/s^2)
    M204 P1000 T2000 ; Set printing and travel accelerations

    The difference between M201 and M204 is that M201 sets acceleration for the whole axis, while M204 sets it by move type.

    I am still tuning my parameters and should probably have a lower acceleration set for the Y axis since it's lugging around more weight on the CoreXY.

    As for your layer delamination problem, I'm stumped. Is it printing from the same Gcode as before, or have you resliced? Has anything else changed that you may not have accounted for? I would have suggested checking your extrusion multiplier and adjusting to make sure you're not getting any gaps between lines, but you've already bumped that.

    What about things like retraction speeds and amounts? Is the area delaminating right after a travel move?

    Is it possible the PID tune previously done was run under different circumstances and gave you different values? Do you have a way to verify your thermistors temperature at the hot end? PETG delaminating is usually a temperature issue. You could try boosting the temp up 10c and running as normal.



  • @Phaedrux:

    Where did you see setting starting acceleration?

    I googled "Gcode M204" and the first link was to the Marlin Firmware site.
    I didn't read the whole thing but took that definition from the first line of page.
    I ain't too bright when it comes to all the gcode jargon so I didn't bother in hopes your explanation
    would be more layman, and it seems to be.
    So does this define speeds for say holes and circles and what not?
    I hope you say yes. I'll add that line to mine immediately.

    My retraction length is probably high now (3.5mm) that I have re-enabled pressure advance, and in truth its been so long that I played with it that I forgot to adjust the retraction back down now that pressure advance is running. I'll try it tonight and maybe that is the fix, but I am bumfuzzled why it all went south in the first place. If my knowledge of the config settings is correct, drive settings wouldn't effect the adhesion, and thats all I was worried about after I got the firmware re-installed.

    Regarding the PID tuning,
    I can't say it's the problem since it was doing this before the tune, since the trends were and still are rock solid, and no I haven't verified the hotend temp after I tuned it. I have a IR temp gun and I used it to verify a while back, but I have the heat block insulated and I was too lazy to let it cool down, take the sock off and check it. The way I have my hotend and cooling duct arranged,(pretty darn close) it will hang if I am not careful when removing and I don't want to try it while it's hot. I had hoped to get lucky and stumble across a bad config setting and I'd be back in business but I've determined that I have to go into full R&R mode now and postpone my little project until this is fixed, so I will also do that check tonight when I get home from work.



  • Here's the thing that stumps me the most, and it occurred to me as I was re-reading your reply…
    I know it would seem to be a temp issue like you said, because logic states that if the plastic isn't hot enough it won't weld to itself. But last night I set it up to what I thought was an extreme. 255c with no fan at all. I was expecting to find a melted blob on my hot bed. But it turned out nicely with exception of the areas I pointed out. Every other part of the model was shiny and strong. Just the thin parts. But with the temp so high and no fan to cool it wouldn't that have had an opposite effect?
    Shouldn't the thinner parts have been completely deformed, but melted together instead of separating?

    Lets say for Pete's sake that my thermistor isn't reading correctly and my temp is lower than it should be.
    Shouldn't the thicker part of the model be effected and not the thinnest?
    I am wondering if it's the mother of all coincidences and my filament is the cause? I am 2/3 into a 1kg spool.
    Could the last 1/3 be off badly? I measured its diameter last night before starting the print in question and it was only .01 off from when I measured it new.
    But is the problem underextrusion? I could pose the same argument about the thicker parts being effected more than the thinnest.
    Btw, its Hatchbox PETG. I know its cheap but I have always had good luck with it.
    I am tempted to come off some money and buy a roll of premium stuff just to see the differences.



  • Maybe try printing a temp tower to see if you get similar lamination issues.

    Are you using the same layer height?

    I guess it's possible that your PETG has taken on some moisture from the air. Has it been a long time since printing with it? Do you hear any hissing or popping sounds or see any steam at the nozzle? Tossing the roll in the oven at the lowest temp for a couple hours to dry it out might help if so.

    Hatchbox may be cheap, but that doesn't mean it's bad. You've had good results before on the same roll so I wouldn't jump straight to blaming the filament.

    Getting your retraction tuned up might be a good start. Too much retraction can lead to under extrusion at the start of the next print move which can look a lot like delamination because there is an entire layer high gap where nothing was extruded. One way to investigate that would be to examine the tool path in your slicer in those specific areas to see if layers are starting there often. That particular section appears to be the inside of a curve, so the slicer may be trying to hide the seam there leading to a higher concentration of layer starts there.

    M204 won't set separate acceleration based on print feature, only the fact that it's a print move versus a travel move. So it won't help for small features like holes. That's up to your slicer. Slic3r has a setting to slow down for small features like that. Cura currently doesn't unless you create a modifier mesh manually. I don't know what you use for a slic3r but if you're printing a lot of parts that have small dimension holes for bolts and things, I recommend slic3r PE for that reason.



  • Sorry for not replying in so long.
    Don't you hate when silly things like, say your job and various life responsibilities get in the way of the important things?

    I still had time to tinker with my machine and I don't want t say it's fixed, but I have learned a few things and I have some suspicions.

    I pretty much started over from scratch regarding my slicer settings. (S3D)
    And I made some mods to my printer frame to accommodate a new location for my extruder drive.
    I shortened up my bowden tube a bit, though I don't think it was too long to begin with but I wanted to try and get it as short as I could so eliminate that as a culprit.
    I have printed several temp test towers, but have had varied results. None of which showed any real adhesion troubles.
    I only noticed it on things like the image I posted earlier and the separating I was having with the model.
    So with that, I made my own test that was comparable to the parts of the model that was failing.

    I printed one at the usual 240c @.2 layer height and though there was not any separation, the layers were very easy to see.
    I did 2 more test, one at 250c and 260c and the results were much better.
    This one was printed at 260c and is my favorite by far, as I have always had to print at a lower layer height to get such clean results as this.


    So I am suspecting that my temperature readings are not correct. As I am sure you know, 260c is way out of the normal printing range for PETG and I though I have never printed anything this hot and attempted to "scald" filament I would assume that under normal circumstances I would have cooked it in the hotend if my temp readings were correct.
    I have a small ir temp gun that doesn't seem to be accurate enough to read the hotend correctly. The best I have gotten with it was 150c.
    Though when reading my hotbed it is spot on accurate, as it matches what the readout has for it.

    I printed a project this past weekend in PLA +, which calls for higher temps than normal PLA. I did a test print in the normal range and sure enough I was getting a small amount of separation. And since one model was a 20 hour print and another was about 6 hours I upped the temp to be safe. The max temp recommendations for it is 225c and I printed at 240 and they both came out nice.

    If you were wondering what these are, my daughter requested these for a school project.
    They are animal cells.
    She will paint them up in the appropriate colors and present them along with an essay in hopes of getting an 'A'.

    So I dunno.
    Until I can find a way to accurately read my hotend's temperature I guess I will shoot from the hip and just tack on a few degrees to my hotend from now on.
    I am still baffled as to why this happened out of no where. The only real benefit I have gained from how well it was printing before the failed FW upgrade attempt, would be discovering how much smoother .2 layer heights look with PETG at higher temps.
    And I print PLA+ a lot and wasn't having any separation at the normal recommended temps.
    Maybe the temperature has always been too low and I have just been lucky.

    It is indeed a great mystery.
    Though I will admit, I am not ruling out "Operator Trouble" as a cause.



  • I have found that temperature in the room requires me to adjust the print temp a little bit.

    Specifically, as winter happened this year, I had some layer separations that I've never experienced before. 5 or 10c bump in print temps fixed them all.



  • I did have this kind of experience with weak PETG some time ago, as far as i could deduce it was cause by a slight mix with another type of plastic (PLA i think) normally the PETG parts i print are really strong but this one part came out so weak i could bend it slightly and at the bend every single layer line would delaminate, could almost pull out the extrustion thread like unraveling a sweater.

    The top of the part was nice and strong as i think by that time the PLA was all cleared out, some hotends keep more plastic then others in the nozzle, even just a tiny amount might cause you issues. Something to keep a eye out for perhaps if you get this again after a filament change.



  • Thanks, Kezat.

    Actually the first troubles occurred after a firmware crash. I was well into a fairly fresh roll when it happened.
    And I have always changed out the nozzle and heatbreak when changing to a different type of filament.
    I only print PLA or PETG and as you suggest, I learned its good practice to start with a fresh nozzle.
    And I even changed the nozzle/throat when this first happened as I thought that the bad adhesion was coming from a clogged nozzle.

    That's not to say I haven't thought it being the filament. But I experienced the same problems with a brand new roll of PLA.
    Admittedly the PLA didn't fail like the PETG did, but I did get a little separation. Upping the temp seemed to eliminate it.

    Danal,

    I am not married so I get to keep my printer inside my climate controlled home. 😉
    The temp doesn't vary much.



  • Have you considered a PT100 temp sensor upgrade?

    Or to verify the temp of the hotend get a multimeter with a thermocouple probe. I've found that the shiny surface and small area of the hotend makes it very difficult to get accurate readings with an IR laser probe.



  • @Phaedrux:

    Have you considered a PT100 temp sensor upgrade?

    You're referring to the E3d temp sensor for the heat block, correct?
    I have that already.


 

Looks like your connection to Duet3D was lost, please wait while we try to reconnect.