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    Flying extruder with 4th axis

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    • anderundefined
      ander
      last edited by

      Hi there! yes, the extruder motor will be hanging from a magnetic ball so it can turn a little in any direction, all the system is almost finished, it has an endstop on top, 2 rails for guiding the arm and a 8metric thread to move the 4th axis. i will post a picture or a video when finished ....hopefully today. the printing volume will be 400mm in diameter ....i was planing to use a 300mm long teflon tube to start with, the shorter the better, but for now i will do tests with 300mm long tube. the extruder motor´s height needs to follow Z height and when it goes to the corners it needs to go down a little.....hopefully wont be so difficult for you to program that in the firmware. i´m only using 1 extruder so we can use the second extruders driver to drive the 4th axis motor.

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      • anderundefined
        ander
        last edited by

        Hi there!!! the setup is complete!! hopefully everything goes fine with this configuration, i just moved the 4th axis putting the conector in the extruder´s driver and works fine so far. i put the pictures here to see the mechanical configuration, and if you have any questions for the development of the firmware just let me know.!6_1542051232800_índice.jpg 5_1542051232800_índic1e.jpg 4_1542051232800_índi1ce.jpg 3_1542051232800_í1ndice.jpg 2_1542051232800_índi11ce.jpg 1_1542051232800_ín11dice.jpg 0_1542051232799_índ111ice.jpg

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        • anderundefined
          ander
          last edited by

          Hi there!
          I made some calculations, and having a 300mm teflon tube and 400mm diameter printing area, when the effector goes to the corner the effector needs to go down 75 mm aproximately, maybe a little bit less taking in mind that the motor also turns. i think that once having the firmware i will need to do many tests and play with those numbers

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          • dc42undefined
            dc42 administrators
            last edited by

            Are you sure that screw drive will be able to move the extruder fast enough? The screw pitch looks very fine in the photo.

            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

            timcurtis67undefined 1 Reply Last reply Reply Quote 0
            • anderundefined
              ander
              last edited by

              I´m not sure at all....we need to test for that, but i didnt wanted to put a belt because it will move down when switching off the printer bending the teflon tube. i think test is needed to see how works and then modify if is needed

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              • timcurtis67undefined
                timcurtis67 @dc42
                last edited by

                @dc42 said in Flying extruder with 4th axis:

                Are you sure that screw drive will be able to move the extruder fast enough? The screw pitch looks very fine in the photo.

                I agree, it looks really fine pitched. I would be using a 4 lead screw that turns 8mm per revolution. I use them on my big printer and can move my heavy table really fast.

                I like the design though. Great job on it.

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                • anderundefined
                  ander
                  last edited by

                  Thanks mate!! I also thought on puting this 4 lead screw but keep in mind that there is 1m long...i had hard time looking for the ones that make 8mm per revolution being 1m long. i did some tests with this configuration and moves really well but you have to push hard in order to gain some speed. another fast option would be to put belts with some counterweight in the other end so there would be no problem when switching off AND it would be more quiet.

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                  • anderundefined
                    ander
                    last edited by

                    Here goes another picture of the whole system0_1542123739940_WhatsApp Image 2018-11-13 at 16.40.18.jpeg

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                    • anderundefined
                      ander
                      last edited by

                      By the way the pitch i´m using is 1.25mm. It is a regular M8 thread

                      timcurtis67undefined 1 Reply Last reply Reply Quote 0
                      • Alexander Mundyundefined
                        Alexander Mundy
                        last edited by

                        Details of the firmware settings for this? Sorry if I didn't understand. I would like to do something similar on my delta but for a camera that follows the Z height of the print but offset by a set amount.

                        Danalundefined anderundefined 2 Replies Last reply Reply Quote 0
                        • Danalundefined
                          Danal @Alexander Mundy
                          last edited by

                          @alexander-mundy said in Flying extruder with 4th axis:

                          Details of the firmware settings for this? Sorry if I didn't understand. I would like to do something similar on my delta but for a camera that follows the Z height of the print but offset by a set amount.

                          Would you be interested in an $10 for the parts (not including stepper or servo) external box that "polls" the printer and does this? It could drive a stepper or a servo (angle, not movement). I've been thinking about creating one, and am curious if others would find it interesting.

                          Delta / Kossel printer fanatic

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                          • anderundefined
                            ander @Alexander Mundy
                            last edited by

                            @alexander-mundy This system was also built thinking on putting a camera to the moveable arm...i designed some holes to attach a camera in a future

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                            • timcurtis67undefined
                              timcurtis67 @ander
                              last edited by

                              @ander said in Flying extruder with 4th axis:

                              By the way the pitch i´m using is 1.25mm. It is a regular M8 thread

                              You can always use a lower microstep setting (1/4 or 1/2) or just use full steps but you will have much more stepper motor noise that way. It will move faster though.

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                              • anderundefined
                                ander
                                last edited by

                                I just found and ordered 4 lead screw of 1m long, is going to move so much faster, and this way i don´t have to change anything to the original setup for now....after uploading the firmware we will see if aditional features are needed when testing like some system to help the motor not to be super bowncy

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                                • anderundefined
                                  ander
                                  last edited by

                                  Hi there!!
                                  I just received the lead screw, tomorrow i will change it so the 4th axis can move so much faster.

                                  @dc42 , did you have any chance of working on the firmware?
                                  i had to cut the 1.2m teflon tube that was going from the motor to the hotend to make the modification and now the printer is not working ever since.

                                  dc42undefined 1 Reply Last reply Reply Quote 0
                                  • dc42undefined
                                    dc42 administrators @ander
                                    last edited by

                                    @ander said in Flying extruder with 4th axis:

                                    Hi there!!
                                    I just received the lead screw, tomorrow i will change it so the 4th axis can move so much faster.

                                    @dc42 , did you have any chance of working on the firmware?
                                    i had to cut the 1.2m teflon tube that was going from the motor to the hotend to make the modification and now the printer is not working ever since.

                                    I'm sorry, I won't have time to look at this until the 2.02 release is finished.

                                    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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                                    • anderundefined
                                      ander
                                      last edited by

                                      Hi there!!
                                      Did you have any chance to look at the 4th axis firmware? My delta is stopped since then 😞

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                                      • dc42undefined
                                        dc42 administrators
                                        last edited by

                                        Yes, I have a build of RRF that supports up to 6 axes on a delta. Still some testing to do, but maybe you can help me with that?

                                        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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                                        • anderundefined
                                          ander
                                          last edited by

                                          Hi There!
                                          Of course i can help, my printer is ready for testing, tell me what to do and i will tell the results.

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                                          • dc42undefined
                                            dc42 administrators
                                            last edited by dc42

                                            Please follow the instructions at https://duet3d.dozuki.com/Wiki/ConfiguringRepRapFirmwareDeltaPrinter?revisionid=HEAD#Section_Adding_additional_towers_to_carry_flying_extruders and use the binary at https://www.dropbox.com/s/fyvibzm0zl92hiy/Duet2CombinedFirmware.bin?dl=0. Caution: this is mostly untested! I suggest you test it at low speeds and reduced motor currents, and that you do not mount the extruder on the 4th carriage yet.

                                            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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