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Discussion in '3D printers' started by Carl Feniak, Sep 29, 2014.

C-Bot

C-Bot

Discussion in '3D printers' started by Carl Feniak, Sep 29, 2014.

A robust Core XY style 3D printer that has a clean parallel belt implementation and whose dimensions are adaptable to meet builder's needs. The use of open builds V-slot and other open hardware make customization easy.

Core XY CoreXY Core-XY V-Slot V Slot Carl Feniak 3D H Bot H-Bot C-Bot C parallel
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  1. grat

    grat New
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    See, I mostly agree with you. Except I got so fed up that I stopped at "I wouldn't trust that board". :)
     
    #1561 grat, Jan 23, 2016
  2. Carl Feniak

    Carl Feniak Journeyman
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    Thanks, I actually get that too with slic3r. I just deleted them, they are artifacts in the XY motor mounts. I hope they don't affect anything. The part(s) don't appear visually impacted.
    Autodesk (at least this free version) seems to very much NOT be flawless. I'll go back to edit a piece and find that a segment is 5.998mm long instead of 6mm or at a 0.0000095 degree angle instead of 0.
     
    #1562 Carl Feniak, Jan 23, 2016
  3. grat

    grat New
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    On the new XY Carriage options STL, I'm having problems separating the tension lever from the direct drive carriage part, both in Cura and Blender.
     
    #1563 grat, Jan 23, 2016
  4. Carl Feniak

    Carl Feniak Journeyman
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    I will repackage that one. I am thinking two packages; one will contain all the parts for a bowden setup and the other for direct feed.
     
    #1564 Carl Feniak, Jan 23, 2016
    Sk8rSeth and Muh_3d like this.
  5. Sk8rSeth

    Sk8rSeth New
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    i just came here to point out that same thing. im very thankful for the work you keep doing on this Carl! youre very responsive and helpful
     
    #1565 Sk8rSeth, Jan 23, 2016
    Carl Feniak likes this.
  6. Carl Feniak

    Carl Feniak Journeyman
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    Thanks, two new folders are now in the files section:
    1) compressed folder with stls
    2) compressed folder with 123D files
    Both are referred to as "C-Bot Rework".
     
    #1566 Carl Feniak, Jan 24, 2016
    Muh_3d likes this.
  7. TruculentMC

    TruculentMC New
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    Offtopic but I found a nice bug in Cura (15.04.3) - split an STL into parts, and then reload all objects.
     
    #1567 TruculentMC, Jan 24, 2016
  8. Carl Feniak

    Carl Feniak Journeyman
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    I think he means that if you try that combination of steps: first import and split an object, then re-import the same set of objects with the split ones on the build plate... something bad happens. Just tried it with slic3r and no issues.
     
    #1568 Carl Feniak, Jan 24, 2016
  9. Carl Feniak

    Carl Feniak Journeyman
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    A note on the bottom frame inner corner brackets... they are quite likely overkill, but since I haven't actually made a 12x12 printer I will leave that up to the builder. Also, the four most inner bolts can't all be inserted with large hex head bolts, either lower profile heads most be used or only two of the four inserted (stagger them). I don't think the later will be an issue as these corners should now be very robust.
    Capture.JPG
     
    #1569 Carl Feniak, Jan 24, 2016
    NeoGames76 and Muh_3d like this.
  10. Muh_3d

    Muh_3d New
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    #1570 Muh_3d, Jan 25, 2016
  11. Austin Seagers

    Austin Seagers Well-Known
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    Hi all,

    Printer is coming along nicely now. Pretty much all of the cutting and crimping and testing of the wiring is completed. Just need to check thermistor calibration, do an at-temp nip up of both nozzles, and check powered movement.

    Do most just have the X endstop (mounted on horizontal moving gantry) wiring dangling? Seems overkill to have a single cable conduit for one endstop

    Probably going to put off the remaining mounting hardware for SSR, PSU, Ramps and LCD, and use them as test prints. I also whipped up a small cable-tie mount for the sake of wiring tidiness. Thought it might be worth sharing. Link is here: M5 20x20 extrusion cable tie mount by austingeorge



    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
     
    #1571 Austin Seagers, Jan 25, 2016
    Krishnakumar and Carl Feniak like this.
  12. trublu832

    trublu832 Well-Known
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    Here's one possible way to do the X endstop wiring. The wires feeding it just run with the bowden tube.
    IMG_9096.JPG
     
    #1572 trublu832, Jan 25, 2016
  13. Austin Seagers

    Austin Seagers Well-Known
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    Ah, not a bad idea. I'll have a go at something to facilitate this tonight. Thanks!

    EDIT: Just noticed you have a similar cable conduit to your toolhead to mine. Does yours resist twisting at all? Or do you have the conduit loosely clamped at one end so that it can twist?
     
    #1573 Austin Seagers, Jan 25, 2016
    Last edited: Jan 25, 2016
  14. trublu832

    trublu832 Well-Known
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    It's a corrugated split tube, it is firmly clamped at both ends but it has good flexibility as the head moves anywhere on the bed.
    IMG_1086.JPG
     
    #1574 trublu832, Jan 25, 2016
    Austin Seagers likes this.
  15. Austin Seagers

    Austin Seagers Well-Known
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    I'll probably just run a knife down a side of the tube tonight to achieve the same effect. It's nice and rigid when clamped, just really resistant to twisting.
    Thanks again.
     
    #1575 Austin Seagers, Jan 25, 2016
  16. trublu832

    trublu832 Well-Known
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    I didn't know they made the same tubing unsplit, it seems to make it more flexible and it was much easier to put all of the wiring in sideways rather than pulling the wires through the end like conduit
     
    #1576 trublu832, Jan 25, 2016
  17. Austin Seagers

    Austin Seagers Well-Known
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    It sounds like you might have a different type of plastic or thickness to mine. I did get mine from a friend who had recently re-wired a house. Yours sounds like it's more of a cable-tidy type of tubing? I was worried about that kind of tube not holding a nice elevated loop under its own and it's contents' weight.

    I did look on farnell/RS and most conduit around 20mm diameter detailed a minimum bend radius of approx 20mm. That screamed "too flexible" to me.

    A cut, or staggered cuts down one side should alleviate the twist restraint though.
     
    #1577 Austin Seagers, Jan 25, 2016
  18. trublu832

    trublu832 Well-Known
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    Here is what I used http://www.amazon.com/gp/product/B00U8LA25O?psc=1&redirect=true&ref_=oh_aui_detailpage_o03_s00
     
    #1578 trublu832, Jan 25, 2016
    Last edited: Jan 25, 2016
  19. Carl Feniak

    Carl Feniak Journeyman
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    #1579 Carl Feniak, Jan 25, 2016
  20. Carl Feniak

    Carl Feniak Journeyman
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    Where did you get the white GT2 belts?
     
    #1580 Carl Feniak, Jan 25, 2016
  21. Austin Seagers

    Austin Seagers Well-Known
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    #1581 Austin Seagers, Jan 25, 2016
  22. Austin Seagers

    Austin Seagers Well-Known
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    #1582 Austin Seagers, Jan 25, 2016
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  23. Sk8rSeth

    Sk8rSeth New
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    #1583 Sk8rSeth, Jan 25, 2016
    Muh_3d likes this.
  24. jk2060

    jk2060 New
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    very nice color! military feel :)

    BTW, do you guys use 5mm for all the screw holes? i realised 5mm is abit to tight for the screw to slot in.. i am trying to enlarge it slightly to 5.1mm so that the screwing strength will not apply to the plate instead.

    Anyone has any view on this?
     
    #1584 jk2060, Jan 25, 2016
  25. Muh_3d

    Muh_3d New
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    Let me (us) know of your progress..
     
    #1585 Muh_3d, Jan 26, 2016
  26. Austin Seagers

    Austin Seagers Well-Known
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    Cheers! S'pose it does now you mention it.

    M5 and all other metric bolts have clearance drill diameters, depending on the fit you're after. http://www.littlemachineshop.com/reference/tapdrillsizes.pdf
     
    #1586 Austin Seagers, Jan 26, 2016
    trublu832 likes this.
  27. Carl Feniak

    Carl Feniak Journeyman
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    That works, I have been designing loose fit 5mm holes to 5.4mm in all my parts (5.5mm in the link).
     
    #1587 Carl Feniak, Jan 26, 2016
  28. Chris Roadfeldt

    Chris Roadfeldt Journeyman
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    Carl, if you are still interested, I am able to pull in stls into 360 and then export them out again. Just let me know what you would want for options and I'll post the step files.
     
    #1588 Chris Roadfeldt, Jan 26, 2016
  29. Carl Feniak

    Carl Feniak Journeyman
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    That would be great again, but let's wait a few days yet as I want to tweak my new Z endstop mount (I don't like the bolt holder, though I did include trublu832's which I do like) and see if anyone else flags any issues. That will help avoid any rework.
     
    #1589 Carl Feniak, Jan 26, 2016
    trublu832 likes this.
  30. ruggb

    ruggb Well-Known
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    FYI - I just tried BABYSTEPPING_Z in Marlin on my unit and it works!!!!!!

    For those who may not know - babystepping allows you to increment the axis by small amounts real time while printing. For a CoreXY machine it only works for the Z axis and U must also have a graphic display.

    It is implemented in ver 1.1 RC, the latest is RC3. If you r using Marlin 1.1 then all u need do is enable babystepping in ADV config file, but u must also disable BABYSTEPPING_XY as that will give u an error b/c it is not implemented for coreXY.
    If u r using 1.0.x then u need to transfer your settings to the 1.1 config files.

    When the printer is printing, u will find babystepping under the TUNE menu at the bottom of the list - I plan to raise it to the top of the list to make it quicker to get to. Rotating the dial CW makes the platform go down. CCW up. NOTE: it does not respect endstops.

    You can tweak the amt it moves with each click BABYSTEP_MULTIPLICATOR. Default is 1

    This is the section of code - the 2 changed lines r marked with //**

    / Babystepping enables the user to control the axis in tiny amounts, independently from the normal printing process
    // it can e.g. be used to change z-positions in the print startup phase in real-time
    // does not respect endstops!
    #define BABYSTEPPING //** uncomment
    #if ENABLED(BABYSTEPPING)
    //#define BABYSTEP_XY //** comment out ==not only z, but also XY in the menu......... more functions
    //not implemented for CoreXY and deltabots!
    #define BABYSTEP_INVERT_Z false //true for inverse movements in Z
    #define BABYSTEP_MULTIPLICATOR 1 //faster movements
    #endif
     
    #1590 ruggb, Jan 26, 2016
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