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BinaryConstruct V3

Discussion in '3D printers' started by BinaryConstruct, Feb 28, 2018.

  1. BinaryConstruct

    BinaryConstruct Well-Known
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    BinaryConstruct published a new build:

    Read more about this build...

    Fusion 360 Assembly: A360
     
    #1 BinaryConstruct, Feb 28, 2018
    Last edited: Mar 1, 2018
  2. BinaryConstruct

    BinaryConstruct Well-Known
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    I am still uploading my drawings and parts. Fusion 360 is giving my some headaches sharing the project files. I will upload STLs once I have them exported.
     
  3. Anthony Bolgar

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    I like the design. I have a question about the frame top rail, would it not be better to use a 20X40 extrusion just like the sides?
     
  4. BinaryConstruct

    BinaryConstruct Well-Known
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    The single 20x20 offset to the rear allows you to slide the t-nuts down the frame for the Z motor bracket and the lead screw supports. This makes assembly a lot easier than trying to hit a t-nut behind a printed part on a vertical structure, since you can pre-assemble the parts with t-nuts on them.
     
  5. JustinTime

    JustinTime Master
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    Did you print the green parts on a different printer than the black parts? I'm asking since I'm straggling with banding on my prints and I see that the black parts have the same banding as I have it but on the green parts I don't see it. I know the banding has something to do with the z-axis screws but I can't seem to solve the problem.
     
  6. BinaryConstruct

    BinaryConstruct Well-Known
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    The banding was due to some earlier designs of this printer used a hanging z lead screw. Once I flipped it and secured the top with thrust bearing as tight as possible, the banding went away.

    In my case I am using the spiral cut aluminum motor mount. They were expanding and contracting like a spring causing z layers a different thicknesses.

    Yes I did use a different printer, but now the issue is solved.
    Nearly all of the parts for this printer we're printed by itself. In the interim, I used temporary aluminum extrusions for parts like the y end caps and open builds part store motor brackets or wood blocks.
    This was I was able to get a working printer with 0 printed parts, and gradually print improvements. The secured leadscrew and better belts have been the biggest quality improvements so far.
     
  7. pek

    pek Veteran
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    Very interesting build, thanks for sharing. How heavy is the X axis? Does the Z axis with gantries works well?
     
  8. BinaryConstruct

    BinaryConstruct Well-Known
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    It is fairly heavy, due to the mass of the dual extruders and motors. I am running my z motors wired in series to compensate.

    This eliminated a step skipping issue I had when the z motors we're wired in parallel. The banding issue was partially caused by unsecured leadscrew and partial by missed steps.

    Currently I print with no problems at 120mm/s with PLA as long as I lay down the first layer at 30-40mm/s.
    Some early versions had horizontal banding that was caused by a belt that was too stiff. I was experimenting with "zero" stretch belts, and they conducted too much vibration, especially at high speed. The slightly stretchy belts have a damping effect.
     
    Anthony Bolgar likes this.
  9. OtterZA

    OtterZA New
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    I like your design for it's rigidity and simplicity. How did you align the Y with the X-Z frame?
     
  10. BinaryConstruct

    BinaryConstruct Well-Known
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    Very careful measurements with a square. It actually wasn't too hard, just requires a little patience and a few test prints. You can measure diagonals on test prints to figure out if you are out of alignment.
     

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