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WIP ExoSlide based CoreXY Printer

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My Duet controlled machine
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    cdthomas9
    last edited by cdthomas9 8 Nov 2020, 20:11 11 Aug 2020, 20:11

    Currently building a fairly large coreXY printer, build volume will be somewhere around 350x350x550. Plans and motion are based on ExoSlide components, using a Duet 3 6HC and 3HC as the controller, coupled with a Pi 4b. Hot end is a Hemera. Still have a way to go on this one.

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      cdthomas9
      last edited by 11 Aug 2020, 20:12

      IMG_20200803_143750961.jpg IMG_20200803_143738710.jpg IMG_20200803_143721920.jpg IMG_20200717_120452228.jpg

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        cdthomas9
        last edited by 11 Aug 2020, 20:23

        IMG_20200809_183149437.jpg IMG_20200809_183143154.jpg IMG_20200809_183133915.jpg

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          cdthomas9
          last edited by 11 Aug 2020, 20:33

          IMG_20200809_183209337.jpg IMG_20200809_183158679.jpg

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            oliof
            last edited by 11 Aug 2020, 21:48

            nice electronics box!

            One comment though: three z leadscrews will be enough to carry the bed and allow you to use auto bed leveling. four will overconstrain your bed.

            <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

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              whopping pochard @oliof
              last edited by 11 Aug 2020, 22:19

              @oliof Correct me if I'm wrong, but it looks like in this case the gantry is moving in Z and the bed is fixed, a la Voron?

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                Phaedrux Moderator
                last edited by 11 Aug 2020, 22:28

                @whopping-pochard It certainly looks that way.

                @oliof The bed itself looks to be stationary and mounted at 3 points. The gantry raises in Z. Which still leads to a motor synchronization and tramming problem.

                Z-Bot CoreXY Build | Thingiverse Profile

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                  oliof
                  last edited by 11 Aug 2020, 22:43

                  oh right. Still overconstrained though (-:

                  <>RatRig V-Minion Fly Super5Pro RRF<> V-Core 3.1 IDEX k*****r <> RatRig V-Minion SKR 2 Marlin<>

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                    Phaedrux Moderator
                    last edited by 11 Aug 2020, 22:54

                    Overconstrained and it would seem to me to be much more difficult to design enough compliance into the gantry to allow for proper adjustment anyway.

                    Z-Bot CoreXY Build | Thingiverse Profile

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                      cdthomas9
                      last edited by 12 Aug 2020, 01:05

                      Yes, the bed is fixed and the gantry is moved on 4 leadscrews. This was how it was designed, I hadn't thought about changing it or that it might introduce problems

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                        cdthomas9
                        last edited by 12 Aug 2020, 01:18

                        Is having 4 Z motors not a good idea? I thought I had seen it around a bit..

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                          cdthomas9
                          last edited by 12 Aug 2020, 01:20

                          Forgot to add a shot of the electronics box so far. I posted this elsewhere asking about cooling but figured I'd want one here in the build topic

                          IMG_20200809_223451372.jpg

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                            Phaedrux Moderator @cdthomas9
                            last edited by Phaedrux 8 Dec 2020, 02:51 12 Aug 2020, 02:51

                            @cdthomas9 said in WIP ExoSlide based CoreXY Printer:

                            Is having 4 Z motors not a good idea? I thought I had seen it around a bit..

                            Oft used and oft maligned. 3 points define a plane, so 4 points adds an extra constraint. When dealing with the flat plane of the bed that just makes it difficult to get leveled since every adjustment changes the position of the other points and the end result is often a saddle shape. In your case though, the bed is fixed and the gantry is moving. This adds a lot of complexity to the system.

                            It's not impossible to get them all 4 points lined up, but it does require more compliance in the joints to allow for contorting the gantry to be in line with the plane of the bed, which adds complications because the XY motion system is relying on the gantry to be rigid.

                            Using 3 points for lifting the gantry probably isn't practical due to the need for rigidity and stability, so 4 points might be best.

                            So 4 points and you can't really build in flexibility to allow for adjustment, so you need to get everything lined up perfectly to prevent binding. It's not impossible, just difficult.

                            If you haven't already I would suggest studying the Voron2 which uses a XYZ gantry like this, but lifted at 4 points with belts on rails. I think they have built in some flex to the gantry and then have a routine to square it up.

                            Z-Bot CoreXY Build | Thingiverse Profile

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                              cdthomas9
                              last edited by 12 Aug 2020, 15:23

                              That's a pretty slick machine, the manual is extremely well done and the engineering looks pretty good. I'd rather have leadscrews over belts, I just feel better about having solid hardware holding the gantry up. Hopefully everything works out and if any issues come up as I progress through the build I'll be able to get them addressed. I may wind up rebuilding this thing at some point if the design gives me problems but we'll have to see. Thanks for your help so far!

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                                Phaedrux Moderator
                                last edited by 13 Aug 2020, 02:23

                                Good luck. I'll be interested to see how it works out.

                                Z-Bot CoreXY Build | Thingiverse Profile

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