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    Minimum layer thickness relative to nozzle?

    Tuning and tweaking
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    • DocTrucker
      DocTrucker last edited by

      Morning,

      I've thought about the maximum layer thickness for a given nozzle size but what about the smallest for good (/slow!) builds? I heard yesterday that ultimakers often run at 0.06 for. 4mm nozzles?

      Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

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      • DocTrucker
        DocTrucker last edited by

        Largely material dependant? ABS flows well but not sure PETG would like thin layers? Bridging different or just more aparrent?

        Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

        deckingman 1 Reply Last reply Reply Quote 0
        • deckingman
          deckingman @DocTrucker last edited by

          @doctrucker

          Hi Wes,
          I think you may run into issues, especially with short moves, where the amount of material to be extruded is actually less than 1 micro-step of the extruder. I recently realised that this can be a problem when using a mixing hot end with "normal" layer heights but with mixing ratios that include low values for one of the filaments. One way to get around it is to use high micro-stepping for the extruder. But, then you can run into the step pulse frequency limit of 200,000 hz. You won't see that with normal print moves but you might with retraction so then you need to run lower retraction speed (if you can).

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

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          • DocTrucker
            DocTrucker last edited by

            I hadn't considered that, thanks for highlighting it. Is that 200kHz figure for the Duet 2 rather than 0.6/0.8.5? I've potentially got a double whammy of only 16 microsteps and slower processor.

            Really must get around to having a crack at my g-code parser. I'd like to have something flag potential issues with slow jerk etc at least for a few trials.

            Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

            deckingman 1 Reply Last reply Reply Quote 0
            • deckingman
              deckingman @DocTrucker last edited by

              @doctrucker said in Minimum layer thickness relative to nozzle?:

              Is that 200kHz figure for the Duet 2 rather than 0.6/0.8.5?

              Yes. I've no idea what the maximum step pulse rate is for the 0.6 and 0.85 but I'd guess it will be lower. DC will no doubt step in and tell us.

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

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              • dc42
                dc42 administrators last edited by

                I haven't measured the maximum step rate on the older Duets, but I suggest you keep it below 120kHz.

                Duet WiFi hardware designer and firmware engineer
                Please do not ask me for Duet support via PM or email, use the forum
                http://www.escher3d.com, https://miscsolutions.wordpress.com

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                • DocTrucker
                  DocTrucker last edited by

                  Thanks. So that's the total number of steps to all drives?

                  Alive: 1 Ormerodish machines. 1 Custom Cantilever. 3 P3Steel. 1 Ciclopish scanner. In build: 1 P3Steel. Controllers: 2 Duet 2 , 2 D0.6, 1 D0.8.5, 1 D3 v0.5, 1 RAMPS/DRV8825, 1 Uno/Scan Card.

                  dc42 1 Reply Last reply Reply Quote 0
                  • dc42
                    dc42 administrators @DocTrucker last edited by

                    @doctrucker said in Minimum layer thickness relative to nozzle?:

                    Thanks. So that's the total number of steps to all drives?

                    It's probably capable of a higher total number of steps to all drives, but I suggest you keep each individual motor below 120kHz. if the MaxReps value reported by M122 goes above about 50, then reduce microstepping to reduce the maximum step pulse frequency.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

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