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    Impossible to set extruder micro stepping above 16ms

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    • observatoerundefined
      observatoer @fcwilt
      last edited by

      @fcwilt Yes, I have removed all the detail setting for E.
      The 100m test is just the usual 120mm marking on the filament and then extruding 100mm at 5mm/s speed. Measuring if there are 20mm left at the end.

      Non of the changes returned a normal extrusion. I gave up and set the extruder to 16 micro steps which works.

      1 Reply Last reply Reply Quote 1
      • observatoerundefined
        observatoer @deckingman
        last edited by observatoer

        @deckingman
        Thank you. This is exactly where I started and I followed your guideline and the description of M350 and M92. Non of this worked which I assume there is a bug.

        I did 100mm testing with all the settings and got exactly 100mm filament thru the extruder. Just not during printing, where there is a very obviously under extrusion happening.

        deckingmanundefined droftartsundefined 2 Replies Last reply Reply Quote 0
        • deckingmanundefined
          deckingman @observatoer
          last edited by

          @observatoer said in Impossible to set extruder micro stepping above 16ms:

          @deckingman
          Thank you. This is exactly where I started and I followed your guideline and the description of M350 and M92. Non of this worked which I assume there is a bug.

          I did 100mm testing with all the settings and got exactly 100mm filament thru the extruder. Just not during printing, where there is a very obviously under extrusion happening.

          I suggest that you change the title of this thread which is quote "Impossible to set extruder micro stepping above 16ms". Because we have now established that it is indeed possible.

          Given that you can extrude 100mm of filament with both 16X and 32X micro stepping, then your under extrusion problem during printing must lie elsewhere. What print speed, layer height, filament type and temperature are you using? What do you have in slicer start gcode.

          What happens if you start a print with the configuration as I described with 16X micro stepping, then change part way through by sending M350 E32? Do you immediately get the under extrusion or is there a delay?

          Can you share a sample of the gcode file that you are experiencing problems with.

          Ian
          https://somei3deas.wordpress.com/
          https://www.youtube.com/@deckingman

          1 Reply Last reply Reply Quote 0
          • droftartsundefined
            droftarts administrators @observatoer
            last edited by droftarts

            @observatoer Are you saying it calculates the steps per mm incorrectly after changing the microstepping with M92? eg:

            27/08/2020, 21:56:37 	M350
                                    Microstepping - X:16(on), Y:16(on), Z:16(on), E:16(on)
            27/08/2020, 21:56:41 	M92
                                    Steps/mm: X: 80.000, Y: 80.000, Z: 400.000, E: 420.000
            27/08/2020, 21:56:55 	M350 E256
            27/08/2020, 21:56:58 	M350
                                    Microstepping - X:16(on), Y:16(on), Z:16(on), E:256
            27/08/2020, 21:57:04 	M92
                                    Steps/mm: X: 80.000, Y: 80.000, Z: 400.000, E: 6720.000
            

            If you can show the output of M350 and M92 before and after a change, that would be helpful.

            Otherwise, look at the motor. According to the specs here, https://www.filastruder.com/products/ldo-stepper-motors-all-types it has an inductance of 5.5mH. If you put the rest of the numbers into the EMF calculator at https://www.reprapfirmware.org/, you get:
            8ffe16bd-0b01-47bb-a34f-a45a344c545a-image.png

            (Ignore the Drive settings and just put the steps per mm in)
            As soon as you double the steps per mm to 1600, you get back EMF problems, and the speed at which motor torque drops halves:

            c09907ed-06de-4bb0-9c91-6641fbc5bc63-image.png
            This only gets worse as you increase motor current or steps per mm. I expect that's where your problem is.

            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

            observatoerundefined 1 Reply Last reply Reply Quote 1
            • observatoerundefined
              observatoer @droftarts
              last edited by

              @droftarts Thanks again for your help in solving this challenge.

              I did some tests, where I stated with the config.g values for stepping:
              M92 X200 Y200 Z3200 E822
              M350 E16 X32 Y32 Z16 E16 I1
              M906 E500
              The system voltage is set to 29.6V @LRS-350-24.

              Then, I did some changes with M350 to see the results. Right in the beginning, I changed the Extruder from E16 to M350 E8. The result was not right because it was not 411 but 205.500.
              The print started and did go on with a under extrusion. The layer height was just 0.10-0.11 instead of 0.2mm.

              I got an under extrusion just from the start even so the values in the config.g are correct.

              Here is a photo of the print (please ignore the abused Fight Club print surface)
              RCG8725 - 1 (1).jpeg

              Here the log of the print with the changes and the feedback of the Duet3:

              28.8.2020, 10:46:47 Printing paused at X217.4 Y41.2 Z0.4
              28.8.2020, 10:46:47 Printing paused at X217.4 Y41.2 Z0.4
              28.8.2020, 10:45:40 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000
              28.8.2020, 10:45:36 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:16
              28.8.2020, 10:45:34 M350 E16
              28.8.2020, 10:45:20 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 3288.000
              28.8.2020, 10:45:15 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:64
              28.8.2020, 10:45:14 M350 E64
              28.8.2020, 10:44:46 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 1644.000
              28.8.2020, 10:44:41 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:32
              28.8.2020, 10:44:38 M350 E32
              28.8.2020, 10:44:09 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:16 <<<<<<< correct layer hight and correct adjustment of microsteps and steps/mm. Layer = 0.2mm
              28.8.2020, 10:44:03 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000 <<<<<<< Until here, the layer hight was just 0.10-0.11 instead of the gcode value of 0.2mm
              28.8.2020, 10:43:59 M92 E822
              28.8.2020, 10:43:15 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 411.000
              28.8.2020, 10:43:10 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:16
              28.8.2020, 10:43:04 M350 E16
              28.8.2020, 10:42:37 M906
              Motor current (mA) - X:1900, Y:1900, Z:1600, E:800, idle factor 20%
              28.8.2020, 10:42:34 M906 E800
              28.8.2020, 10:41:56 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 6576.000
              28.8.2020, 10:41:51 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:256
              28.8.2020, 10:41:48 M350 E256
              28.8.2020, 10:40:38 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000
              28.8.2020, 10:40:34 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:32
              28.8.2020, 10:40:25 M350 E32
              28.8.2020, 10:39:46 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 3288.000
              28.8.2020, 10:39:40 M350 E128
              28.8.2020, 10:39:09 M906
              Motor current (mA) - X:1900, Y:1900, Z:1600, E:450, idle factor 20%
              28.8.2020, 10:39:06 M906 E450
              28.8.2020, 10:37:50 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 1644.000
              28.8.2020, 10:37:43 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:64
              28.8.2020, 10:37:37 M350 E64
              28.8.2020, 10:36:36 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000
              28.8.2020, 10:36:29 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:32
              28.8.2020, 10:36:26 M350 E32
              28.8.2020, 10:36:11 M350
              Microstepping - X:32(on), Y:32(on), Z:16(on), E:16
              28.8.2020, 10:36:06 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 411.000
              28.8.2020, 10:35:23 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 411.000
              28.8.2020, 10:35:19 M)2
              Error: Failed to parse major M-code number ()2)
              28.8.2020, 10:35:13 M350 E16
              28.8.2020, 10:34:47 M906
              Motor current (mA) - X:1900, Y:1900, Z:1600, E:500, idle factor 20%
              28.8.2020, 10:34:42 M906 E500
              28.8.2020, 10:33:09 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 205.500 <<<<<<Here, the stepping was changed from initial E16 to E8, but the steps have been divided by 4 instead of 2 <<<<<<
              28.8.2020, 10:33:00 M350 E8
              28.8.2020, 10:30:36 M92
              Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000

              28.8.2020, 10:29:04 Leadscrew adjustments made: -0.050 0.125 0.229, points used 4, (mean, deviation) before (0.135, 0.154) after (-0.000, 0.107)
              28.8.2020, 10:29:04 Height map loaded from file heightmap.csv
              28.8.2020, 10:29:04 Warning: The height map was loaded when the current Z=0 datum was not determined. This may result in a height offset.
              28.8.2020, 10:27:13 M32 "0:/gcodes/Extrusion_test_CoreXY_PLA_0.2000mm.gcode"
              File 0:/gcodes/Extrusion_test_CoreXY_PETG_0.2000mm.gcode selected for printing
              28.8.2020, 10:22:42 Upload of Extrusion_test_CoreXY_PLA_0.2000mm.gcode successful after 0s*

              Config.g started with these values:

              M92 X200 Y200 Z3200 E822
              M350 E16 X32 Y32 Z16 E16 I1

              Basically, I see two issues:

              • The start extrusion is not right, even so the parameters are correct.
              • The first calculation by changing with M350 is wrong.

              I hope, this helps to find or explain the topic.

              observatoerundefined 1 Reply Last reply Reply Quote 0
              • observatoerundefined
                observatoer @observatoer
                last edited by observatoer

                Another interesting thing:

                If I have a config.g with this values:

                M92 X200 Y200 Z3200 E822
                M350 E16 X32 Y32 Z16 E32 I1

                ..and I switch of and on the machine, I get this in the console:

                28.8.2020, 12:07:28 M92
                Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000
                28.8.2020, 12:07:22 M350
                Microstepping - X:32(on), Y:32(on), Z:16(on), E:16(on) <<<<E16 instead of E32 <<<<

                Look like the steps/mm are correct calculated for X, Y and Z, but not for E.

                Checked the config.g for other instances of M92/M350 but there are non. The above ones are the only ones.

                engikeneerundefined 1 Reply Last reply Reply Quote 0
                • engikeneerundefined
                  engikeneer @observatoer
                  last edited by

                  @observatoer you have two E entries in that config line. There's and E16 at the start, then an E32 at the end

                  @observatoer said in Impossible to set extruder micro stepping above 16ms:

                  M350 E16 X32 Y32 Z16 E32 I1

                  I wonder if this could be the source of your issues?

                  E3D TC with D3Mini and Toolboards.
                  Home-built CoreXY, Duet Wifi, Chimera direct drive, 2x BMG, 300x300x300 build volume
                  i3 clone with a bunch of mods

                  observatoerundefined 1 Reply Last reply Reply Quote 0
                  • observatoerundefined
                    observatoer @engikeneer
                    last edited by

                    @engikeneer Thanks for pointing it out. It was a mistake, introduced by me with this test. To reconfirm, I have done the test again and started with E32 in M92.

                    Here is the console log of my changes during the print:

                    28.8.2020, 14:12:56 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 1644.000
                    28.8.2020, 14:12:52 M350
                    Microstepping - X:32(on), Y:32(on), Z:16(on), E:32
                    28.8.2020, 14:12:49 M350 E32
                    28.8.2020, 14:12:29 M350
                    Microstepping - X:32(on), Y:32(on), Z:16(on), E:16
                    28.8.2020, 14:12:22 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000 >>>>> correcting the steps healed the under extrusion. Normal layer from here
                    28.8.2020, 14:12:15 M92 E822
                    28.8.2020, 14:12:05 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 411.000
                    28.8.2020, 14:11:59 M350
                    Microstepping - X:32(on), Y:32(on), Z:16(on), E:16
                    28.8.2020, 14:11:15 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 411.000
                    28.8.2020, 14:11:10 M350 E16
                    28.8.2020, 14:10:08 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 1644.000
                    28.8.2020, 14:10:03 M350 E64
                    28.8.2020, 14:09:28 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000
                    28.8.2020, 14:09:24 M350
                    Microstepping - X:32(on), Y:32(on), Z:16(on), E:32
                    28.8.2020, 14:09:20 M350 E32
                    28.8.2020, 14:08:48 M92
                    Steps/mm: X: 400.000, Y: 400.000, Z: 3200.000, E: 822.000 >>>>undee extrusion from start
                    28.8.2020, 14:08:42 M350
                    Microstepping - X:32(on), Y:32(on), Z:16(on), E:32(on)

                    <<<<< startet with this config.g
                    M92 X200 Y200 Z3200 E822
                    M350 X32 Y32 Z16 E32 I1

                    28.8.2020, 14:07:33 Leadscrew adjustments made: 0.148 0.125 0.051, points used 4, (mean, deviation) before (0.096, 0.035) after (-0.000, 0.005)
                    28.8.2020, 14:07:33 Height map loaded from file heightmap.csv
                    28.8.2020, 14:05:26 M32 "0:/gcodes/Extrusion_test_CoreXY_PLA_0.2000mm.gcode"
                    File 0:/gcodes/Extrusion_test_CoreXY_PLA_0.2000mm.gcode selected for printing

                    Same wrong start and miscalculation for E.

                    droftartsundefined 1 Reply Last reply Reply Quote 0
                    • droftartsundefined
                      droftarts administrators @observatoer
                      last edited by

                      @observatoer I don’t see any incorrect calculation. You said you started with M350 E32 and M92 E811. It should have been M350 E16, with E811 steps per mm. So it’s not surprising it underextruded, which you eventually correct with M92.

                      Do you really need more extruder resolution than 811 steps per mm, at 16x microstepping?! Like you’ve already found out, your motor can’t handle it at the speeds you print.

                      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

                      observatoerundefined 1 Reply Last reply Reply Quote 0
                      • observatoerundefined
                        observatoer @droftarts
                        last edited by

                        @droftarts

                        I understand, if I setup E to 32 and ask by M350, to get the correct steps/mm wich would be in this case 1644. But, it is giving me 822 which is wrong for E32. And I get under extrusion.
                        Interesting for me, the values for X, Y and Z are calculated and displayed correct for X32, Y32 and Z16. Just not for E.

                        The stepper can handle up to 256 micro steps and reports the astronomic step count correctly, if I correct the initially wrong handled E value. No under extrusion. Just questionable, if it's really extruding wis 256 micro steps or just reporting a value.

                        droftartsundefined 1 Reply Last reply Reply Quote 0
                        • droftartsundefined
                          droftarts administrators @observatoer
                          last edited by

                          @observatoer

                          <<<<< startet with this config.g
                          M92 X200 Y200 Z3200 E822
                          M350 X32 Y32 Z16 E32 I1

                          This is what you said it is set to in config.g. If you send M350 E32, nothing has changed, so steps per mm are still 822. When you sent M350 E64, the steps per mm were correctly doubled. This isn’t the firmware getting it wrong!

                          The stepper can handle up to 256 micro steps

                          Of course it can. At slower step rates. But microstepping beyond 16x is, in general, pointless. The spec sheet for your motor says the step accuracy is 9 degrees +/- 5% which is pretty standard. That means that there’s a 10% swing in accuracy at FULL step. It’s why Gecko drives only use 10x microstepping; you won’t get any more accuracy from the motor by increasing microstepping. However, using interpolation is worth it, as the driver can smooth the transition between steps.

                          and reports the astronomic step count correctly

                          Do you mean the Duet reports the step count? The motor definitely doesn’t.

                          If you send M122 while printing, you can see if the motor is skipping steps. Look at the ‘Driver’ lines, eg:

                          
                          Driver 0: standstill, reads 37420, writes 12 timeouts 0, SG min/max 0/0
                          Driver 1: standstill, reads 37422, writes 11 timeouts 0, SG min/max 0/0
                          Driver 2: standstill, reads 37422, writes 11 timeouts 0, SG min/max 0/0
                          Driver 3: standstill, reads 37422, writes 11 timeouts 0, SG min/max 0/0
                          Driver 4: standstill, reads 37423, writes 11 timeouts 0, SG min/max 0/0
                          Driver 5: standstill, reads 37423, writes 11 timeouts 0, SG min/max 0/0
                          

                          The ‘SG min/max’ shows the minimum and maximum torque on the motor. If ‘max’ is 1023, the motor has stalled/skipped steps.

                          The issue here is that you have a pancake stepper as an extruder motor, with high inductance, that cannot step fast enough for the speed you want to print at, when you increase the E steps per mm. Get a more appropriate motor if you want to use high step rate and fast speed.

                          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

                          observatoerundefined 1 Reply Last reply Reply Quote 0
                          • observatoerundefined
                            observatoer @droftarts
                            last edited by

                            @droftarts Thank you Ian. Is there any specific motor you would recommend for this application?

                            droftartsundefined 1 Reply Last reply Reply Quote 0
                            • droftartsundefined
                              droftarts administrators @observatoer
                              last edited by

                              @observatoer I don’t really know what you’re trying to achieve. Faster speeds? On an extruder there’s many other limitations, eg how quick you can melt filament. Higher accuracy, ie more steps per mm? Gearing down the extruder would be a better bet than increasing microstepping for the reason I said above, but you may lose high speed. Both? Good luck!

                              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

                              observatoerundefined 1 Reply Last reply Reply Quote 0
                              • observatoerundefined
                                observatoer @droftarts
                                last edited by

                                @droftarts In the first place, I would really like to understand the behaviour of this software. Not more and not less.
                                As per description, if I set the M92 line for the correct steps at 16 micro step, I can change the steps/mm by typing M350 plus the command and value for X, Y, Z and E.
                                This is what I have done with this line:

                                M92 X200 Y200 Z3200 E822

                                These are the correct steps for a rate of 16 micro steps.

                                The next line in config.g is this:

                                M350 X32 Y32 Z16 E32 I1

                                I understand, the M350 command adapts step rates other than the baseline 16 in M92 to the mentioned values.

                                If I then type M92, I shall get the new calculated values for X, Y Z and E. Correct?

                                Why do I get the correct new M92 value vor X(=400@32), Y(=400@32) and Z(=3200@16) and an wrong Value of E. It shall be E1644 (for the requested 32) and is reported as E844.
                                Is there a difference, why these values are reported like this?

                                And regarding the stepper; I did reduce the current to 500mAh but this did not change anything regarding the above mentioned behaviour. Sorry, if I cannot describe it any better,

                                droftartsundefined 1 Reply Last reply Reply Quote 0
                                • droftartsundefined
                                  droftarts administrators @observatoer
                                  last edited by droftarts

                                  @observatoer right, I see where the problem is. If you set M92 and M350 in config.g, that’s the values used. Even if M350 is after M92, the M92 definition is not assumed to be at 16x microstepping. It would be strange to explicitly set something in the config.g, and for the firmware to then alter it. If you exclude M350 from config, or the E parameter, I would expect it defaults to 16x.

                                  Any subsequent M350 changes M92. I appreciate this is not clear in the Gcode entries for M92 and M350.

                                  Edit: the configuration tool puts M350 in config.g before M92. Though I think the order doesn’t matter in confi.g.

                                  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

                                  observatoerundefined 1 Reply Last reply Reply Quote 0
                                  • observatoerundefined
                                    observatoer @droftarts
                                    last edited by observatoer

                                    @droftarts OK. I refer to https://duet3d.dozuki.com/Wiki/Gcode#Section_M350_Set_microstepping_mode

                                    and this description:

                                    When M350 is processed, the steps/mm will be adjusted automatically to allow for any changes in microstepping. Therefore you can either:

                                    a) Set Steps/mm correctly for the default 1/16 microstepping, then set the microstepping to the desired amount using M350:

                                    M92 X80 Y80 Z400 ; set axis steps/mm
                                    M92 E420:430 ; set extruder 0 and 1 steps/mm
                                    M350 X128 Y128 Z128 E128:128 ; set microstepping
                                    or

                                    b) Set the microstepping using M350 and then set the correct steps/mm for that microstepping amount:

                                    M350 X128 Y128 Z128 E128:128 ; set microstepping
                                    M92 X640 Y640 Z3200 ; set axis steps/mm @128 microstepping
                                    M92 E3360:3440 ; set extruder 0 and 1 steps/mm
                                    Assuming that in the first example the microstepping was initially at the default x16, both the above examples result in the same steps/mm settings.

                                    Could you suggest me the two lines for M350 and M92 who will work?

                                    Edit: I have now played with every thinkable combination and variation of microsteppings. One common thing happens:

                                    Regardless of any previous setting (verified in the console), as soon as the print starts, the steps/mm for the extruder are reset to 822.
                                    All other steppers keep the right values as defined.

                                    PS: I got the hint regarding the adjustment of the micro stepping from dc42 posting in this forum.

                                    1 Reply Last reply Reply Quote 0
                                    • Phaedruxundefined
                                      Phaedrux Moderator
                                      last edited by

                                      Here's how I do it to keep it simple

                                      M350 X16 Y16 Z16 E16 I1; set x16 microstepping with interpolation
                                      M92 X80 Y80 Z400 E411 ; steps per mm set as if for x16 microstepping
                                      M350 E64 ; alter microstepping for E axis

                                      firmware now correctly calculates the new steps per mm required.

                                      The key is to set everything for x16 first and don't change your M92, just have it set to work with x16. Then you can modify the microstepping after and it will correctly calculate.

                                      Z-Bot CoreXY Build | Thingiverse Profile

                                      fcwiltundefined observatoerundefined 2 Replies Last reply Reply Quote 0
                                      • fcwiltundefined
                                        fcwilt @Phaedrux
                                        last edited by

                                        @Phaedrux said in Impossible to set extruder micro stepping above 16ms:

                                        M350 X16 Y16 Z16 E16 I1; set x16 microstepping with interpolation
                                        M92 X80 Y80 Z400 E411 ; steps per mm set as if for x16 microstepping
                                        M350 E64 ; alter microstepping for E axis

                                        That matches the documentation with the exception that the docs say that x16 is the default so the first M350 should not be needed.

                                        Are the docs in need of a correction?

                                        Frederick

                                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                                        1 Reply Last reply Reply Quote 0
                                        • observatoerundefined
                                          observatoer @Phaedrux
                                          last edited by

                                          @Phaedrux said in Impossible to set extruder micro stepping above 16ms:

                                          Here's how I do it to keep it simple

                                          M350 X16 Y16 Z16 E16 I1; set x16 microstepping with interpolation
                                          M92 X80 Y80 Z400 E411 ; steps per mm set as if for x16 microstepping
                                          M350 E64 ; alter microstepping for E axis

                                          firmware now correctly calculates the new steps per mm required.

                                          The key is to set everything for x16 first and don't change your M92, just have it set to work with x16. Then you can modify the microstepping after and it will correctly calculate.

                                          I did exactly this and the machine reported exactly these values back which is correct. BUT, as soon as I start a print job, ONLY the value for the extruder E is reset to the 16 micro stepping value!
                                          I checked all possible macros who could alter the setting during start, but non of them includes M350 or M92 values.

                                          Something is definitely not working on my machine. I have changed the stepper already but as you see, same issue. I have also made a new sd card for the PI and did the latest test with these sw. I'm hesitant to build new config files at the moment.

                                          Still same status: This new setting is not working properly on my machine.

                                          JoergS5undefined 1 Reply Last reply Reply Quote 0
                                          • JoergS5undefined
                                            JoergS5 @observatoer
                                            last edited by

                                            @observatoer can you please check config-override.g and the start codes of the printed g-code file, maybe they are changing the E setting. Do the startup macros include M501 maybe?

                                            observatoerundefined 1 Reply Last reply Reply Quote 0
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