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HULK-XY (Fixed Build Plate, C-Beam, CoreXY)

Discussion in '3D printers' started by Adam Filipowicz, Sep 21, 2015.

  1. Adam Filipowicz

    Adam Filipowicz Veteran
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  2. Joe Santarsiero

    Joe Santarsiero OB addict
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    Wow. Great modeling and render.
    Overall the belt system seems too complex, but what do I know. :)
     
  3. Adam Filipowicz

    Adam Filipowicz Veteran
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    The Z Belt definately needs some love and simplification. perhaps I should remove the Cbeams on the Y Axis. and replace with something else.. i have seem other more elegant CoreXY belt layouts. but i want to avoid printed brackets if possible. also I think i should go to Nema 17s. not sure if one Nema 17s could run all 4 Z screws
     
  4. Joe Santarsiero

    Joe Santarsiero OB addict
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    I'm not sure about that either. Maybe the right 17 or an additional slaved one in the mix. Sounds like some math is involved in that decision.
    How do you level a drawbridge like that?
     
  5. Steven Bloom

    Steven Bloom Veteran
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    Really like your design. I would go for a bigger build plate. I have an 18" x 18" heated bed in mine and its awesome to have all that room.
     
  6. Adam Filipowicz

    Adam Filipowicz Veteran
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    going 18"x 18" is a good idea (in the long run) I have a 12" build plate that I can salvage from the Makerfarm i3v 12" for the short term.. I have also added spool holders and turned it around.
    id like to enclose it in acrylic. and and use the extrusion channels to hold the panels. but i need to rejig to make this happen.

    Do you think I need to have the top framed off.. i like having just the posts, I feel it would be rigid enough this way.

    Build plate is 6mm Alum + Heater, + 6mm Borsilicate glass plus PEI
    Id like to use the idea of Piezio disks to do auto bed leveling. under the build plate

    using C beam on the Y. takes up alot of room. I need to revise.
    Hulk CoreXY 3d v3 Sep 22.jpg
     
  7. Steven Bloom

    Steven Bloom Veteran
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    How about something super simple. Sorry for my sloppy drawing.

    Thanks Steven

    2015-09-22 10.01.57.jpg
     
  8. Adam Filipowicz

    Adam Filipowicz Veteran
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    I want to avoid multiple steppers per axis. for sync issues. with this config you are driving 5 steppers vs 3.
     
  9. Steven Bloom

    Steven Bloom Veteran
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    You can drive the 2 motors of the Z and the Y on 1 stepper driver each. Then the X alone. We do this all the time on 3D Printers. You could also do auto bed leveling with this. I do this on my big printer.
     
  10. Adam Filipowicz

    Adam Filipowicz Veteran
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    yes but if one stepper misses a step. it will be out of sync, and will need calibration and will bind. keeping it to one stepper adds complexity with the belts but will stay synced. My makerfarm i3v has dual Z steppers running off the same driver but everytime i calibrate it they are out of sync from each other by a slight amount
     
  11. Steven Bloom

    Steven Bloom Veteran
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    Wow. My machine is never out of sync
     
  12. Adam Filipowicz

    Adam Filipowicz Veteran
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  13. Adam Filipowicz

    Adam Filipowicz Veteran
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  14. Adam Filipowicz

    Adam Filipowicz Veteran
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    Is this still CoreXY?
    Hulk CoreXY 3d v3 Sep 22 belt Layout A.jpg
     
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  15. Adam Filipowicz

    Adam Filipowicz Veteran
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    Here is another version. where there is a belt loop on top and bottom. no cross over. but does this still qualify as CoreXY with its advantages or Hbot? Hulk CoreXY 3d v3 Sep 22 belt Layout B.jpg
     
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  16. Adam Filipowicz

    Adam Filipowicz Veteran
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    Here is an update. after playing around for several hours on an alternate belt config for corexy I ended up staying where I started. but im not more confident in my choice. I also ended up going to a Hybrid Direct drive for the extruder.. there is a very short bowden tube. 50mm between them. this adds weight to the gantry but should get rid of the typical bowden issues. I am hoping that since im using Nema 23's and GT3 Belt and 40x40 extrusion the added weight wont be so bad.

    I also pushed the XY Steppers in to the frame so they dont stick out the back anymore Hulk CoreXY 3d v4 Sep 23.jpg
     
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  17. Steven Bloom

    Steven Bloom Veteran
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    Did you figure out the Generic cost of this in Open Build parts yet ???
     
  18. Adam Filipowicz

    Adam Filipowicz Veteran
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    not yet. im going to try and revise so extrusions are 500mm or less
     
  19. runninfarmer

    runninfarmer Veteran
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    You can use one geared Nema17 for your z-axis. That's what I'm using for my Samson build. 5:1 reduction ratio should be plenty of torque, but you could go up a little bit. I get geared steppers from phidgets.com.
     
  20. DarkAlchemist

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    Yeah, we do this all the time thanks to Josef Prusa but it has been found out that a 2 motor Z drive on one driver DOES lose sync. I was telling people about this years ago but only recently (look around reprap.org's forum) has people actually measured it. This quote is from another thread for another printer but it too was trying to use 2 motors with 1 driver so I thought I would post Mr. Davis' reply the pertains to this issue:
    Even Josef Prusa finally saw the error in his ways with 2 motors 1 driver.

    My design will not use two motors due to what I know, what I have seen on my own boat weight i3 rework, and what I have read. What some are doing is using a belt to drive two leadscrews/acme screws with one motor and the reports are that doesn't lose any amount of sync at all. Since this is for Z the loss of resolution by using a GT2 belt wouldn't matter.

    Oh, one thing on this printer's design I would be cautious about is the open air design on those 4 legs especially with tall prints and trying to go fast or have rapid accelerations.
     
    #20 DarkAlchemist, Sep 26, 2015
    Last edited: Sep 26, 2015
  21. DarkAlchemist

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    Was reading up and spotted this. /High five and you are spot on. This is one reason so many printers have to have Z recalibrated before every print after long print runs or at least once a day or two. Just a bad, no a terrible, design to have two motors on one driver and to have two motors on two drivers requires some feed back of some sort or at least two end stops and go from there (that is if neither loses a single step if one does look out).
     
  22. Adam Filipowicz

    Adam Filipowicz Veteran
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    Here is an update. feed back appreciated.
    I really want to make the build plate solid. with no movement at all.
    belt layout is rough and should be able to be tighter to the sides. so it doesnt eat up the X Travel as much.
    Hulk CoreXY 3d v9 Oct 9.jpg
    Revised Z belt layout
    Hulk CoreXY 3d v9 Oct 9 Z.jpg
     
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  23. JustinTime

    JustinTime Master
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    I like the four z axis screws and that they are inside the c-beam.

    When you design it make sure you can get a closed loop belt the size that you want. They make it in measurements that may not fit your design.
     
  24. DarkAlchemist

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    $125.20 (Silver or 1 dollar more for black) for each leg made me sick. :( I love the design but it really is very costly when all said and done even though very few parts are being used.
     
  25. Adam Filipowicz

    Adam Filipowicz Veteran
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    Unfortunately your right. I wish some of the parts were cheaper. I calculate aprox $100 each, they are 420mm long
     
    #25 Adam Filipowicz, Oct 9, 2015
    Last edited: Oct 9, 2015
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  26. Adam Filipowicz

    Adam Filipowicz Veteran
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    Know a good place for closed Gt2 belts?
     
  27. DarkAlchemist

    DarkAlchemist Veteran
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    100 dollars each for what? The price I quoted was for the 500mm version of the c-beam linear actuator which is an absolutely hideous price and is the only negative thing I now see.
     
  28. Adam Filipowicz

    Adam Filipowicz Veteran
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    Yep I priced it based on buying longer extrusions and cutting down. but really its the plates, bearings, rods, block and other small parts that really make it add up. I Wish they had a smaller C Channel linear extrusion and smaller Gantry plate for it
     
  29. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    You might check here.
     
  30. Adam Filipowicz

    Adam Filipowicz Veteran
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