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Dash-X 3D Printer: Innovative design

Discussion in '3D printers' started by Neil Rosenberg, May 21, 2019.

  1. Neil Rosenberg

    Neil Rosenberg Veteran
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    Neil Rosenberg published a new build:

    Read more about this build...
     
  2. Shortyski13

    Shortyski13 Journeyman
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    What about CoreXY didn't you like? Asking because I'm building one (waiting for all the parts to come in).
     
  3. Neil Rosenberg

    Neil Rosenberg Veteran
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    Hi there and thanks for the message.

    I want to be careful not to criticize CoreXY, as there are some VERY fine printers of this type. Take for example the Fusion series (i.e. F306) -- their printers use string drive in a CoreXY configuration and put out truly amazing print quality very quickly. They also cost over $4k each.

    My comment is based on experiences with belt-driven printers. I have seen symptoms of unwanted flexing of the arms/carriages cause by (I think) interaction between the two axes. It was most pronounced in the H-Bot (a known issue), but I also saw it on CoreXY. In short, many of the movements exert unbalanced forces on the various bars and bearings and thus create the opportunity for positional errors. The Cross-Beam (and Prusa-style for that matter) does not have this issue. In fact the Dash-X Cross-beam goes one step further by having active synchronous drive on both ends of each beam.

    I'm talking about really fine distinctions. I was able to get good parts from CoreXY, but they didn't quite rise to the quality my newly acquired Creality Ender 3 and CR10s Pro. BTW, the main drawback of these two fairly inexpensive Creality printers is their speed, or lack thereof.

    Early results with this Cross-Arm system in Dash-X suggest that I'm getting quite close to Creality quality, while still keeping the speed up where I like it.

    Of course your mileage may vary.

    I'll report more as I dial it in and see how good it can get.

    Neil
     
  4. Shortyski13

    Shortyski13 Journeyman
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    What's your build volume? I don't see it listed but maybe I'm just missing it.
    I decided against the dual gantries due to a bit higher cost (I'm already a little over budget) and it would be tougher making them thick to span the large gap on my design's large volume, without flexing. I could be wrong tho and a bltouch probably negates that last point. Maybe i should have gone that way haha.
    Im hoping i don't get too much ringing with 10mm belts, but ill find out! In the name of experimentation!
     
  5. Neil Rosenberg

    Neil Rosenberg Veteran
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    My build volume is 300mm cubed. Might be a few mm short of that in the z axis.

    Love to see what you're building, keep in touch!
     
  6. Shortyski13

    Shortyski13 Journeyman
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    Mine is the Mushu Large CoreXY, if you scroll down a few through the 3d printers. It's not fully modelled but it has most of it. I do still need to add a few pics of the lift frame. It's around 20x26x28in build volume.
     
  7. Neil Rosenberg

    Neil Rosenberg Veteran
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    Very interesting!

    I designed/built a 24" cube printer a few years back, but when the reality of printing times became apparent I decided it wasn't really suitable for making parts in my lifetime. In that printer I used the Volcano hot end plus a .8mm dia nozzle. Even with that, very large parts took an eternity.

    Best of luck with your project.

    Neil
     

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