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    Texture mapping with feltpen carousel?

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    lithopane colour printing texture mapping
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    • o_lampeundefined
      o_lampe
      last edited by

      Today I tried to get the latest news about THE post processing app for RRF3 and eg. PrusaSlicer. But informations were sparse.
      The manual of PS mentions a way to implement scripts and guided me to a github page with 4-9 years old examples. 😲
      I'm sure there has been a development going on in the last few years, especially with the SBC-option for Duet3.

      So what's your favourite post processing app on a Raspberry?
      It should have features like finding a string, replace and insert command lines, extract numbers and convert them from string2float.

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      • Phaedruxundefined
        Phaedrux Moderator
        last edited by

        I think there is more discussion of prusaslicer post processing on the prusa forums. I don't do much post processing myself but I do recall finding myself there at one point.

        Z-Bot CoreXY Build | Thingiverse Profile

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        • o_lampeundefined
          o_lampe
          last edited by o_lampe

          I tested 4 different felt pens from different brands with white PLA and 3 of them hardly stick to the filament or dry over time.
          Only a noname permanent marker did the job and I could extrude some colored filament in free air.
          The result was quite disappointing, I could hardly see a difference. Black turns into shades of grey 😉 and red gets pink.
          A mix of red and blue finally showed pale violet. I believe it was better because I used twice the ink.
          I also noticed that a lot of the color sticked to the nozzle and my hope is that the colors show more clearly when the nozzle actually prints something.
          I will build a carousel now for the pens I chose and see where a thick layer of ink leads to.

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          • Phaedruxundefined
            Phaedrux Moderator
            last edited by

            https://www.youtube.com/watch?v=yQwkHDDed0o&t=87s&ab_channel=MakeAnything

            for your research

            Z-Bot CoreXY Build | Thingiverse Profile

            o_lampeundefined fmaundefined 2 Replies Last reply Reply Quote 0
            • o_lampeundefined
              o_lampe @Phaedrux
              last edited by

              @Phaedrux
              Thanks for the video, I knew it was possible!
              In the comments there where hundreds of replies regarding servos moving the pens, etc... I believe it's just a matter of time until we see a texture mapping of some kind.
              So I can finish my project and wait for others to come up with a solution. (much faster than I could with my limitted knowledge and budget)

              Maybe my idea is two steps forward in the agenda, but as soon as they come up with a color mixing sharpie-tool, they want to use it in sync with the print.
              Et Voila: Texture mapping.

              o_lampeundefined 1 Reply Last reply Reply Quote 0
              • o_lampeundefined
                o_lampe @o_lampe
                last edited by o_lampe

                @o_lampe said in Texture mapping with feltpen carousel?:

                Maybe my idea is two steps forward in the agenda...

                Let's get crazy and talk about step three in my agenda:
                Build a Delta printer onTop of my CoreXY and attach an effector that holds the feltpens and solenoids. (No carousel required)
                Then print a layer with CoreXY & park the printhead.
                Then dye the perimeters with the Delta using one felt pen at a time. The data is extracted from the original gcode and can include mixing colors and patterns.
                Then park the Delta and go on printing.

                Print-dye-print-dye (or PDPD) as I'd like to call it in my biography 😉

                Will it require two Duet boards or is it just a matter of toolchange?
                I wouldn't care since this is IMHO the best way to get brilliant color texture mapping without a multicolor mixing extruder.

                Phaedruxundefined T3P3Tonyundefined 2 Replies Last reply Reply Quote 1
                • Phaedruxundefined
                  Phaedrux Moderator @o_lampe
                  last edited by

                  @o_lampe said in Texture mapping with feltpen carousel?:

                  Build a Delta printer onTop of my CoreXY and attach an effector that holds the feltpens and solenoids. (No carousel required)

                  The carousel sounds easier, no?

                  Z-Bot CoreXY Build | Thingiverse Profile

                  o_lampeundefined 1 Reply Last reply Reply Quote 0
                  • T3P3Tonyundefined
                    T3P3Tony administrators @o_lampe
                    last edited by T3P3Tony

                    @o_lampe said in Texture mapping with feltpen carousel?:

                    Will it require two Duet boards or is it just a matter of toolchange?

                    In theory, given a Duet system with enough stepper drivers and other outputs, you could switch the mapped axis and kinematics on every tool change CoreXY -> Delta tool1 -> delta tool2 ->CoreXY etc.

                    But just because you can do so, it does not mean that you should !

                    I think it would require very careful though to how it fails, how homing can always be safe no matter what configuration it is in etc. Homing might actually be ok, as long as you always home the delta first... I think you might need to home between each switch between Delta and CoreXY...

                    Offsets could be used to make the delta reach down into the CoreXY build space without having to change the coordinates of the print between the two printers... 🤔 .... hmm If you decide to do this I would love to see it!

                    How do you propose to extract the colour information from the model and convert it into sensible paths for your felt tip pen delta toolchanger?

                    www.duet3d.com

                    o_lampeundefined 1 Reply Last reply Reply Quote 0
                    • o_lampeundefined
                      o_lampe @T3P3Tony
                      last edited by

                      @T3P3Tony said in Texture mapping with feltpen carousel?:

                      hmm If you decide to do this I would love to see it!
                      How do you propose to extract the colour information from the model and convert it into sensible paths for your felt tip pen delta toolchanger?

                      In another thread, i added a second carrier to my CoreXY. I guess I'll follow this route and use it as pen-holder.
                      The idea of texture mapping came, when I saw parts printed as wood and thought, there is no wood grain to see.
                      Flat horizontal surfaces with random patterns would be an easy start, since any mistake wouldn't be so obvious.
                      My python experience is pretty limitted, but with some help, we could extract each surface line of a print and detect which pixels of the texture it covers. Defining tools with different colours leads to a pattern each involved pen would ink. Inking vertical walls would require the PDPD method I described above.
                      Describing the tool colours would be in RGB or CMY manner. Same as the bitmap-structure of the texture is. Then we have to allow a threshold to find the best matching colour or how to mix two colours.

                      Then the size of the print and texture must fit. And the origin must be fixed.
                      It's probably a long way until we see a texture mapped Mona Lisa 😉

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                      • o_lampeundefined
                        o_lampe @Phaedrux
                        last edited by o_lampe

                        @Phaedrux said in Texture mapping with feltpen carousel?:

                        @o_lampe said in Texture mapping with feltpen carousel?:

                        Build a Delta printer onTop of my CoreXY and attach an effector that holds the feltpens and solenoids. (No carousel required)

                        The carousel sounds easier, no?

                        Yes, but the colour saturation is so much better when we ink the already printed part. And that requires some extra tool axis'

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                        • DaBitundefined
                          DaBit
                          last edited by DaBit

                          Not much of a braincrunching project (which is usually most of the fun), but a decent option to texture 3D prints could be hydro-dipping:

                          alt text

                          It can do wood grain nicely.

                          Requires a suitable inkjet printer, hydrodipping sheets, activator and a bucket of water. I never actually did it, but maybe I might someday.

                          o_lampeundefined 1 Reply Last reply Reply Quote 2
                          • o_lampeundefined
                            o_lampe @DaBit
                            last edited by

                            @DaBit
                            Looks good too.
                            I'm also sure there are SLA printers which dye every layer with an inkjet, but they don't fit in my budget.

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                            • DaBitundefined
                              DaBit
                              last edited by

                              Sure, directly painting the surface makes sense. How to get decent resolution is a good question. Inktjet gets you there. Felt markers, meh.

                              For occasional use hydrodipping might just be the answer. Standard patterns are available as rolls, custom can be done with blank sheets and an inkjet printer (but not any inkjet).

                              I might want to try it one day. UV-unwrap the object in Blender and use hydrodipping to transfer graphics to a printerd part.

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                              • o_lampeundefined
                                o_lampe
                                last edited by

                                Just found a new playground for feltpen-layer inking:
                                I made some monochrome Lithopanes and realized, how easy it would be to add some colour by inking just the right places between each layer.
                                Finally a green Yoda Lithopane 🤢

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                                • o_lampeundefined
                                  o_lampe
                                  last edited by

                                  I promised you a carousel, but here is a draft of a different way of toolchanging.
                                  The red tool is active, the crossbeam can move along the bed.
                                  When the crossbeam parks between the curved "OpenV-extrusions" the tools can trade places. Imagine the whole rear area is full of parking tools.
                                  They all have their own motor, geared like the Hitchhiker, but running on rack and pinion.

                                  The curved OpenV profile is printed, there is no need for a tight and accurate guideance. Only the crossbeam is the real stuff.

                                  MerryGoRoundToolchanger.jpg

                                  I hope you get my intention...

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                                  • fmaundefined
                                    fma @Phaedrux
                                    last edited by

                                    @phaedrux said in Texture mapping with feltpen carousel?:

                                    https://www.youtube.com/watch?v=yQwkHDDed0o&t=87s&ab_channel=MakeAnything

                                    for your research

                                    @o_lampe, did you try with natural translucent filament?

                                    Frédéric

                                    o_lampeundefined 1 Reply Last reply Reply Quote 0
                                    • o_lampeundefined
                                      o_lampe @fma
                                      last edited by

                                      @fma
                                      I bought white filament, before I knew...and I guess with the "direct inking" I'm planning, it is the better choice.

                                      fmaundefined 1 Reply Last reply Reply Quote 0
                                      • fmaundefined
                                        fma @o_lampe
                                        last edited by fma

                                        @o_lampe Painting on printed part is not easy: ink tends to diffuse along the layers...

                                        I also made some tests with a black inkjet cartridge, but the ink does not stick to the PLA... I think it would require to find the correct ink, which stick on printed part, and compatible with inkjet head (I tried aerograph ink, but it jammed the head!).

                                        I think inkjet is better with powder 3D printing: https://3dprintingindustry.com/news/build-3d-printer-uses-powder-ink-jet-technology-31951

                                        I plan to make tests with pens, as Make Anything did; it is a very easy setup...

                                        Frédéric

                                        o_lampeundefined 1 Reply Last reply Reply Quote 0
                                        • o_lampeundefined
                                          o_lampe @fma
                                          last edited by

                                          @fma said in Texture mapping with feltpen carousel?:

                                          I plan to make tests with pens, as Make Anything did; it is a very easy setup...

                                          I already figured out, only 'permanent markers' stick to PLA.
                                          I think, I've seen the video and their process is not able to produce real textures.
                                          You'd have to dye the filament with a timed process. I'd better like to steal the mapping algorhythm from "velocity printing" and rewrite it to add ink layer by layer.
                                          I don't expect perfect results, but a powder printer with inkjet is a bit above my budget..Let's see how bad it is..

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