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Tesseract

Discussion in '3D printers' started by JCPhlux, Oct 22, 2015.

  1. JCPhlux

    JCPhlux Veteran
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    adamcooks likes this.
  2. JCPhlux

    JCPhlux Veteran
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    I will add real photos of the build this weekend. The build is about 95% done. just have to design one endstop and rewire it.
     
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  3. James_Hopkins

    James_Hopkins Well-Known
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    It looks great. I can't wait to see it.

    I wonder how using 2 lead screws for the axis is going to work out. Could it rock front or back. Or even get jammed.

    I'll be following this :)
     
  4. JCPhlux

    JCPhlux Veteran
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    It is very stable. With the XY gantry riding on 4 rails and 2 lead screws is is very strong. I have also placed the lead screw at the center of gravity of the gantry.
    Once I finish up modeling the last few parts I will post of videos of it in action.
     
  5. Balu

    Balu Veteran
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    What made you go for a moving gantry as Z instead of the build plate? Wouldn't this require longer bowden tubes so it can move up and down with the gantry? And wiring seems a little more work too, since motors, end stops, extruder, etc. have to move up and down with it?

    I love to see all the different builds on here. It helps to think about different options and their possible pros and cons while figuring out what I'd do for a build. :)
     
  6. JCPhlux

    JCPhlux Veteran
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    One of the greatest contributors to vibration a.k.a. ripple a.k.a. shadow a.k.a. ghosting is build plate movement. With a fixed plate you don't have that issue. All the movement is on the hot-end side so you don't get any ghosting.
    Yes there is a bit more work but I think it is worth it.
     
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  7. Balu

    Balu Veteran
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    Hm. I thought it's the relative movement between the hot end and the build plate. If the build plate is fixed, but the hot end vibrates with movement, don't you still get ghosting?
     
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  8. JCPhlux

    JCPhlux Veteran
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    Ghosting all about movement of the printed object. If you look at an object with ghosting it is relative to the direction that the build plate moves. Your hot end if of good quality(E3D) will not affect this. it is all about the motion of the unsupported molten plastic.
     
  9. Balu

    Balu Veteran
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    Hm. I thought ghosting happens when there's unwanted movement between the place the plastic comes out and the place where it's supposed to go.

    So if your build plate with the object is absolutely static, but the gantry itself (or the frame further up) starts to oscillate with too high acceleration values for example, you will still get ghosting, won't you? Or if the belt allows stretching / contracting on sudden movement changes.
     
  10. JCPhlux

    JCPhlux Veteran
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    Yes there is a chance of that but I think I have addressed most of that with my design.
    1. The CoreXY is great for this with the belt being pulled and pushed(sorta) you don't get the slack in movement you would have in a traditional h-bot.
    2. I have the CoreXY gantry mounted to the frame at 6 point giving it a very stable non oscillating build environment.
    3. Most ghosting happens when the object is jerked around... think of it like a jello mold on a plate. Yes there is not that kind of crazy movement but you are dealing with molten plastic so there is some even if only for a few seconds, if it stayed molten for longer it would not be ghosting it would be blobbing.
    4. There will always be quality issues the faster your movement settings are, with the current generation of 3d printer this is always going to be an issue. I get around this buy using good quality software to generate my g-code.
     
    #10 JCPhlux, Oct 23, 2015
    Last edited: Oct 23, 2015
  11. stargeezer

    stargeezer Veteran
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    Re your point 4 - What software are you using?
     
  12. JCPhlux

    JCPhlux Veteran
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    I use Simplify3D. It is a bit pricey but I find it worth it. I have had print jobs that failed every time with slic3r come out flawless with it.
     
  13. adamcooks

    adamcooks Veteran
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    Wouldn't your firmware really control point number 4. I am excited to see how this comes out. I guess you got your jamming issues straightened out. I think that moving the gantry is definitely the way to go with large format printers. Ryan Carlyle has been tinkereing with a core xyz using 4 steppers and a mile of specra, he also built a delta out of a few square frames, one of which shares a name with yours. [​IMG]

    What controller are you using?
     
  14. JCPhlux

    JCPhlux Veteran
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    That picture hurts my brain. It looks cool just not very functional.
     
  15. JCPhlux

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    Simplify3D will change the feed rates depending on the complexity.
    Just a ramps 1.4 but I am using drv8825 drivers at 32 micro steps.
     
  16. adamcooks

    adamcooks Veteran
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    How is this coming along? I would love to see some pics. I am about to do a 200mm^3 bot for a buddy, this would be quite nice setup for it. I might add a leadscrew, I like odd numbers.
     
  17. JCPhlux

    JCPhlux Veteran
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    Waiting on a closed belt from china. I had to redesign the Z-Axis for 3 threaded rods as I was having issues with it staying level with fast movements. I will try to get some pictures posted this week as I am off all week.
     
  18. JustinTime

    JustinTime Master
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    Is that like a pocket 3d printer or something? :D
     

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