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Bad print quality with dual prints vs. single extruder prints

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Tuning and tweaking
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  • undefined
    sebkritikel @Visionary
    last edited by sebkritikel 29 Mar 2021, 18:52

    @visionary I don't have any insight at this time, but I know others have posted about this in the past - unfortunately none of them got back to me regarding investigating the issue further. FWIW I have not experienced the layer line issues exhibited in your (as well as TBN3DMaker) image.

    https://forum.duet3d.com/topic/19482/idex-z-not-matching-when-using-t0-and-t1-on-the-same-layer?_=1617043749826

    I'll follow along and chime in if I think of anything.

    Large(ish?) IDEX - 6HC, 1HCL
    Stratasys Dimension 1200es to 6HC Conversion

    undefined 1 Reply Last reply 29 Mar 2021, 20:47 Reply Quote 0
    • undefined
      Visionary @sebkritikel
      last edited by 29 Mar 2021, 20:47

      @sebkritikel

      Thanks. Wish I knew this problem before going for IDEX...

      Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

      undefined 1 Reply Last reply 30 Mar 2021, 00:21 Reply Quote 0
      • undefined
        sebkritikel @Visionary
        last edited by 30 Mar 2021, 00:21

        @visionary I'm hoping to see some additional folks chime in with some test steps (what you did is along the lines of what I asked those other folks to due). Any chance you could share this specific GCODE file for the print? What if the towers were much larger in length/width (100mm? 200mm?)?

        I don't quite think its fair to chalk this up to specifically IDEX - like I said, I have not experienced this (on any flavor of RRF2 or RRF3) on my IDEX machine, and I see no reason why this effect would discriminate with respect to kinematics type ( I could see this happening on tool changers, other multi-tool setups).

        Large(ish?) IDEX - 6HC, 1HCL
        Stratasys Dimension 1200es to 6HC Conversion

        undefined 1 Reply Last reply 30 Mar 2021, 11:50 Reply Quote 0
        • undefined
          Visionary @sebkritikel
          last edited by 30 Mar 2021, 11:50

          @sebkritikel

          One thing that might cause this problem to occur is that each extruder layer is printed 2 layers at a time, before switching to the other extruder. This means one layer of the two is printed on cooled layer and the other on relatively hot layer. However, I don't have way to test this as Cura doesn't seem to allow printing one layer at a time (except with one extruder).

          Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

          1 Reply Last reply Reply Quote 0
          • undefined
            Alex.cr
            last edited by 30 Mar 2021, 13:42

            Is been awhile since I have done any dual extrusion prints with a duet but here’s what I found in the past that led to similar problems.

            You said you are using cura, when it’s printing two layers at the same time does it run one counter-clockwise then the next one clockwise? This would mean you could have backlash issues.

            Next, are the temperatures stable when printing? When one head is parked are you dropping the temp to standby? If so how hot is it when it starts to print? If you don’t have temp wait commands or if the PID is not set up properly I could see this being an issue as well. It might be worth putting some G4 commands in to help temp stability, just for testing.

            The difference in sheen from the lower to the upper section looks like the lower section printed hotter than the upper. What material is this?

            Third and most likely unrelated, it looks like you retractions/pressure advance are leaving holes. I would look into that at some point.

            Just my thoughts on places to look.

            Voron2.4/Duet3 SBC+6HC+3HC+1LC+1HCL(x2) - Delta/Duet2 Wifi - CubePro/Duet2 Wifi+Duex5 - Laser/Duet3 Mini5+ - Cel Robox - U̶p̶3̶0̶0̶+/D̶u̶e̶t̶3̶ ̶6̶H̶C̶+̶LC1̶ - F̶T̶-̶5̶/̶D̶u̶e̶t̶2̶ ̶W̶i̶f̶i̶ - S̶o̶l̶i̶d̶o̶o̶d̶l̶e̶

            undefined 1 Reply Last reply 30 Mar 2021, 14:59 Reply Quote 0
            • undefined
              timcurtis67 @Visionary
              last edited by 30 Mar 2021, 13:54

              @visionary said in Bad print quality with dual prints vs. single extruder prints:

              For some reason my prints that use both extruders look awful. Corners look more jagged and even straight lines are not consistent from layer to layer.

              IMG_20210329_211825.jpg

              I printed two one wall towers (taller tower in the picture) about 50mm apart from each other and used extruder 0 for the other and extruder 1 for the other. The other tower was about 40% shorter (extr0 tower). It is easy to see at which height the other tower was completed.

              Printer I use is Duet 3 with RRF 3.2 configured to IDEX.

              I can't figure what could cause this.

              Did you print 2 towers at the same time (ditto printing)?

              Or were you switching heads for each tower by level?

              I ditto print all the time with my IDEX with no issues.

              If you are printing by switching heads then are the heads even off of the bed or do you have an offset in one of them? You could have a Z backlash issue. The heads are constantly changing the Z axis for the tool offsets.

              The other issues on the part look like pressure advance settings to me.

              1 Reply Last reply Reply Quote 0
              • undefined
                Visionary @Alex.cr
                last edited by 30 Mar 2021, 14:59

                @alex-cr
                @timcurtis67

                • All layers are printed counter clockwise.

                • My printing extruder temperatures vary quite a bit, maybe about 4-6 degrees of overshoot and 3-4 degrees max under. I'll try add extra waiting commands (maybe about 10s) after each temperature reach to test how this affects print quality. For some reason Auto PID tuning didn't give very good results for my heaters, but I'll try run it again.

                • Print material is ABS with 242 Celsius temp.

                • Both towers are printed separately with only one extruder extruding at once.

                • I try not use Z-hop and other backlash causing settings on Z-axis.

                • I probably should re-tune PA, although it used to be ok.

                Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

                undefined 2 Replies Last reply 30 Mar 2021, 15:05 Reply Quote 0
                • undefined
                  timcurtis67 @Visionary
                  last edited by 30 Mar 2021, 15:05

                  @visionary So your heads are set the same off of the table? No G10 Z offset for Tool1?

                  1 Reply Last reply Reply Quote 0
                  • undefined
                    timcurtis67 @Visionary
                    last edited by 30 Mar 2021, 15:06

                    @visionary said in Bad print quality with dual prints vs. single extruder prints:

                    @alex-cr
                    @timcurtis67

                    • All layers are printed counter clockwise.

                    • My printing extruder temperatures vary quite a bit, maybe about 4-6 degrees of overshoot and 3-4 degrees max under. I'll try add extra waiting commands (maybe about 10s) after each temperature reach to test how this affects print quality. For some reason Auto PID tuning didn't give very good results for my heaters, but I'll try run it again.

                    • Print material is ABS with 242 Celsius temp.

                    • Both towers are printed separately with only one extruder extruding at once.

                    • I try not use Z-hop and other backlash causing settings on Z-axis.

                    • I probably should re-tune PA, although it used to be ok.

                    Also you need a good PID tune first on both heads to get good printed parts. Why wasn't autotune working well? What errors did you get?

                    undefined 1 Reply Last reply 30 Mar 2021, 15:12 Reply Quote 0
                    • undefined
                      Visionary @timcurtis67
                      last edited by 30 Mar 2021, 15:12

                      @timcurtis67

                      No Z-axis offsets, but I have offsets on X and Y.
                      I didn't get errors with PID auto tune, except errors from too slow heating temp rise speed. I raised one the settings for the heater to prevent that error. The PID settings just don't work as well I'd expect. Temperatures settles too slowly.

                      Note that my extruders have custom water cooled setup, with different types of extruders: Flexion extruder on the other and Zesty nimble on the other.

                      Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

                      undefined undefined 2 Replies Last reply 30 Mar 2021, 16:14 Reply Quote 0
                      • undefined
                        timcurtis67 @Visionary
                        last edited by 30 Mar 2021, 16:14

                        @visionary
                        Different extruders shouldn't matter if the are calibrated correctly.

                        So if you just print the tower with tool 0 and then print a tower with the other tool 1 do they both look the same? Do they both have the same measurements when compared?

                        1 Reply Last reply Reply Quote 0
                        • undefined
                          Alex.cr @Visionary
                          last edited by Alex.cr 31 Mar 2021, 03:56

                          @visionary said in Bad print quality with dual prints vs. single extruder prints:

                          I didn't get errors with PID auto tune, except errors from too slow heating temp rise speed. I raised one the settings for the heater to prevent that error. The PID

                          @Visionary When people mention that they had heating too slowly after autotuning it usually leads me to believe that they either did not do one of the following things:

                          1. Save the results to config.g
                          2. Use M500 to save the results to config-override.g and use M501 at the end of config.g
                          3. They don't realize they have an M501 at then end of their config.g and are only changing the settings in config.g and not config-override.g

                          Can you confirm that your M307 settings from your autotuning is set up correctly? I am really starting to think this is your main problem considering the overshoot you are describing above. I hate to see +-1...

                          Post your config.g for us to take a look.

                          Voron2.4/Duet3 SBC+6HC+3HC+1LC+1HCL(x2) - Delta/Duet2 Wifi - CubePro/Duet2 Wifi+Duex5 - Laser/Duet3 Mini5+ - Cel Robox - U̶p̶3̶0̶0̶+/D̶u̶e̶t̶3̶ ̶6̶H̶C̶+̶LC1̶ - F̶T̶-̶5̶/̶D̶u̶e̶t̶2̶ ̶W̶i̶f̶i̶ - S̶o̶l̶i̶d̶o̶o̶d̶l̶e̶

                          undefined 1 Reply Last reply 31 Mar 2021, 09:10 Reply Quote 0
                          • undefined
                            o_lampe
                            last edited by o_lampe 31 Mar 2021, 07:18

                            @Visionary
                            You could print both towers with only one tool (then the other tool) just to see, if it's an temp-drop issue or bad retraction/PA settings.
                            The picture shows the result of the Flexion or the Nimble?

                            Your setup is a good testrig for retraction/PA with idle time compensation. I hope that this feature is already on the FW-whishlist?
                            Until it is released, we have to use wipe-towers or prime-towers. Did you use any tool-prep towers?

                            undefined 1 Reply Last reply 31 Mar 2021, 09:11 Reply Quote 0
                            • undefined
                              Visionary @Alex.cr
                              last edited by 31 Mar 2021, 09:10

                              @alex-cr said in Bad print quality with dual prints vs. single extruder prints:

                              @visionary said in Bad print quality with dual prints vs. single extruder prints:

                              I didn't get errors with PID auto tune, except errors from too slow heating temp rise speed. I raised one the settings for the heater to prevent that error. The PID

                              @Visionary When people mention that they had heating too slowly after autotuning it usually leads me to believe that they either did not do one of the following things:

                              1. Save the results to config.g
                              2. Use M500 to save the results to config-override.g and use M501 at the end of config.g
                              3. They don't realize they have an M501 at then end of their config.g and are only changing the settings in config.g and not config-override.g

                              Can you confirm that your M307 settings from your autotuning is set up correctly? I am really starting to think this is your main problem considering the overshoot you are describing above. I hate to see +-1...

                              Post your config.g for us to take a look.

                              G90                                                ; send absolute coordinates...
                              M83                                                ; ...but relative extruder moves
                              M550 P"My Printer"                                 ; set printer name                                
                              M669 K11 Y-1:-1:0:1  
                              
                              ; Network
                              M552 P0.0.0.0 S1                                   ; enable network and acquire dynamic address via DHCP
                              M586 P0 S1                                         ; enable HTTP
                              M586 P1 S0                                         ; disable FTP
                              M586 P2 S0                                         ; disable Telnet
                              
                              ; Drives
                              M569 P0.0 S1                              		   ; physical drive 0.0 goes forwards X
                              M569 P0.1 S1                               		   ; physical drive 0.1 goes forwards U
                              M569 P0.2 S0                                       ; physical drive 0.2 goes forwards Y
                              M569 P0.3 S1                                       ; physical drive 0.3 goes forwards Z
                              M569 P0.4 S1                                       ; physical drive 0.4 goes forwards E0
                              M569 P0.5 S1                                       ; physical drive 0.5 goes forwards E1
                              
                              M584 X0.1 U0.0 Y0.2 Z0.3 E0.4:0.5                          	; set drive mapping
                              M350 X16 U16 Y16 Z16 E16:16 I1                              ; configure microstepping with interpolation
                              M92 X80.00 U80.00 Y80.00 Z640.00 E2700:185          		; set steps per mm
                              M566 X350.00 U350.00 Y350.00 Z60.00 E120.00:3200              ; set maximum instantaneous speed changes (mm/min)
                              M203 X12000.00 U12000.00 Y12000.00 Z180.00 E1800.00:2000          ; set maximum speeds (mm/min)
                              M201 X600.00 U600.00 Y600.00 Z20.00 E120.00:3000                ; set accelerations (mm/s^2)
                              M906 X950 U950 Y1400 Z1000 E700:1500 I45                    	; set motor currents (mA) and motor idle factor in per cent
                              M84 S30                                            				; Set idle timeout
                              
                              M569 P0.0 V25 H25 D3  
                              M569 P0.1 V25 H25 D3                           
                              M569 P0.2 V25 H25 D3                         
                              
                              M915 P0.0 S3 R0 H134 T25 F1	
                              M915 P0.1 S3 R0 H134 T25 F1			
                              M915 P0.2 S3 R0 H134 T25 F1
                              
                              ; Axis Limits
                              M208 X-58.4 U5 Y0 Z0 S1                                   	; set axis minima
                              M208 X391 U429 Y400 Z375 S0                             	; set axis maxima
                              
                              ; Endstops
                              ;M574 X1 S1 P"io1.in"                             	; configure active-high endstop for low end on X via pin !^io2.in
                              ;M574 U2 S1 P"io2.in"                             	; configure active-high endstop for high end on U via pin !^io1.in
                              M574 X1 S1 P"!^io1.in"                             	; Inductive sensor NPN straight on
                              M574 U2 S1 P"io2.in"                             	; Inductive sensor PNP straight on + pull down
                              M574 Y1 S1 P"io5.in"                             	; configure active-high endstop for low end on Y via pin !^io3.in
                              M574 Z1 S1 P"io4.in"                             	; configure active-high endstop for low end on Z via pin !^io4.in
                              
                              ; Z-Probe: NOT USED
                              M558 P0 H5 F120 T6000                              ; disable Z probe but set dive height, probe speed and travel speed
                              M557 X15:215 Y15:195 S20                           ; define mesh grid
                              
                              ; Heaters
                              M308 S0 P"temp0" Y"thermistor" T100000 B3974       ; configure sensor 0 as thermistor on pin temp0
                              M950 H0 C"out0" T0                                 ; create bed heater output on out0 and map it to sensor 0
                              M307 H0 B1 S1.00                                   ; enable bang-bang mode for the bed heater and set PWM limit
                              M140 H0                                            ; map heated bed to heater 0
                              M143 H0 S130                                       ; set temperature limit for heater 0 to 120C
                              
                              M308 S1 P"temp1" Y"thermistor" T100000 B4725 C7.06e-8       ; configure sensor 1 as thermistor on pin temp2
                              M950 H1 C"out1" T1                                 ; create nozzle heater output on out1 and map it to sensor 1
                              M307 H1 B0 S1.00 D30                                  ; disable bang-bang mode for heater  and set PWM limit
                              M307 H1 R2.399 C262.2 D5.02 S1 V23.8
                              M143 H1 S280                                       ; set temperature limit for heater 1 to 280C
                              
                              M308 S2 P"temp2" Y"thermistor" T100000 B4725 C7.06e-8       ; configure sensor 1 as thermistor on pin temp2
                              M950 H2 C"out2" T2                                 ; create nozzle heater output on out1 and map it to sensor 1
                              M307 H2 B0 S1.00 D30                                   ; disable bang-bang mode for heater  and set PWM limit
                              M307 H2 R2.125 C261.6 D5.93 S1.00 V23.8
                              M143 H2 S280                                       ; set temperature limit for heater 1 to 280C
                              
                              M307 H0 A110 C180 D5 B1 						   ; Bed slow temperature rise
                              
                              ; Fans
                              M950 F0 C"out7" Q500                               ; create fan 0 on pin out7 and set its frequency
                              M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
                              M950 F1 C"out8" Q500                               ; create fan 1 on pin out8 and set its frequency
                              M106 P1 S0 H-1                                     ; set fan 1 value. Thermostatic control is turned off
                              
                              ; Tools 
                              ; tool 0, X-axis
                              M563 P0 D0 H1 X0 F0                                 		; define tool 0
                              G10 P0 R0 S0 X0 Y0 Z0                                    	; set tool 0 axis offsets
                              ; tool 1, U-axis 
                              M563 P1 D1 H2 X3 F1
                              G10 P1 R0 S0 Y0.57 U1.2 Z0                                    	;  plus U shifts to left OLD VALUES: 1,195 (20.3), 
                              									
                              
                              
                              ; Miscellaneous
                              M575 P1 S1 B57600                                  ; enable support for PanelDue
                              M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
                              
                              T0													; select tool
                              
                              M501
                              

                              M307 report results:
                              M307 H2
                              Heater 2 model: heating rate 2.032, cooling time constant 260.1, dead time 6.75, max PWM 1.00, calibration voltage 23.7, mode PID
                              Computed PID parameters: setpoint change: P13.0, I0.311, D61.5, load change: P13.0, I0.679, D61.5

                              M307 H1
                              Heater 1 model: heating rate 2.361, cooling time constant 139.7, dead time 4.33, max PWM 1.00, calibration voltage 23.7, mode PID
                              Computed PID parameters: setpoint change: P17.5, I0.710, D52.9, load change: P17.5, I1.484, D52.9

                              I did do M500 after tuning with M501 in config.

                              Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

                              undefined 1 Reply Last reply 31 Mar 2021, 18:13 Reply Quote 0
                              • undefined
                                Visionary @o_lampe
                                last edited by 31 Mar 2021, 09:11

                                @o_lampe said in Bad print quality with dual prints vs. single extruder prints:

                                @Visionary
                                You could print both towers with only one tool (then the other tool) just to see, if it's an temp-drop issue or bad retraction/PA settings.
                                The picture shows the result of the Flexion or the Nimble?

                                Your setup is a good testrig for retraction/PA with idle time compensation. I hope that this feature is already on the FW-whishlist?
                                Until it is released, we have to use wipe-towers or prime-towers. Did you use any tool-prep towers?

                                Print shown in the picture is done with flexion. I didn't use prime towers for it.

                                Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

                                1 Reply Last reply Reply Quote 0
                                • undefined
                                  Alex.cr @Visionary
                                  last edited by 31 Mar 2021, 18:13

                                  @visionary

                                  What hotend/thermistor/heater are you using? Are both of them the same hot ends?

                                  You said you were running a custom water cooled setup, is everything custom (heat break, spreader, heater block)?

                                  The auto tuned numbers are significantly different between the two.

                                  Voron2.4/Duet3 SBC+6HC+3HC+1LC+1HCL(x2) - Delta/Duet2 Wifi - CubePro/Duet2 Wifi+Duex5 - Laser/Duet3 Mini5+ - Cel Robox - U̶p̶3̶0̶0̶+/D̶u̶e̶t̶3̶ ̶6̶H̶C̶+̶LC1̶ - F̶T̶-̶5̶/̶D̶u̶e̶t̶2̶ ̶W̶i̶f̶i̶ - S̶o̶l̶i̶d̶o̶o̶d̶l̶e̶

                                  undefined 1 Reply Last reply 1 Apr 2021, 09:09 Reply Quote 0
                                  • undefined
                                    Visionary @Alex.cr
                                    last edited by 1 Apr 2021, 09:09

                                    @alex-cr said in Bad print quality with dual prints vs. single extruder prints:

                                    @visionary

                                    What hotend/thermistor/heater are you using? Are both of them the same hot ends?

                                    You said you were running a custom water cooled setup, is everything custom (heat break, spreader, heater block)?

                                    The auto tuned numbers are significantly different between the two.

                                    Only nozzle, heat block, thermistor and heat break are the same. I'm not sure if heater cartridge is the same with both. All of the shelf parts are from E3D.

                                    Main printer: 3-5 Axis, 400x400x450 Duet 6HC || https://grabcad.com/eetu-4/models

                                    undefined 1 Reply Last reply 1 Apr 2021, 09:25 Reply Quote 0
                                    • undefined
                                      o_lampe @Visionary
                                      last edited by 1 Apr 2021, 09:25

                                      @visionary said in Bad print quality with dual prints vs. single extruder prints:

                                      I'm not sure if heater cartridge is the same with both

                                      That would be intersting..do you have a multimeter? The resistance of the cartridges would tell a lot. (maybe you have a mixup of 12V/24V heaters?)

                                      1 Reply Last reply Reply Quote 0
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