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Voxel OX 3D Printer

Discussion in '3D printers' started by Marshall Peck, Sep 27, 2015.

  1. crispin

    crispin Well-Known
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    Yes!
     
  2. Craig Anderson

    Craig Anderson Journeyman
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  3. knabo

    knabo Well-Known
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    I finally finished my Voxel Ox build. Here are some pictures:
    IMG_2066.JPG IMG_2067.JPG IMG_2068.JPG IMG_2069.JPG IMG_2070.JPG IMG_2065.JPG
     

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    crispin likes this.
  4. Craig Anderson

    Craig Anderson Journeyman
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  5. Craig Anderson

    Craig Anderson Journeyman
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    When I built mine, I considered a single motor z axis. Lately I have experienced layer problems utilizing 2 color printing. No problem with single color, two color requires a lot of z axis movement. So one variable is the Z axis dual motors staying in sync. I test them with a block off of the edge of my build plate. I am seeing variations, but don't know why. One issue may be my moving the z axis as I load and unload my twin Bowden extruders which are mounted on the z axis support. Another is the fact that if you turn your machine off and on you run the chance that one of the motors will zero differently.
    So I have been engineering a simple and realistic method to convert my machine to a single motor dual lead screw machine. After some thought, I decided to keep the lead screw flexible connector and bearing. Placing a belt pulley directly on the top of the lead screw will put a bending moment on the screw when the belt is tightened. My design leaves the flex connector and adds a 5mm shaft upward that is supported by two 16 x 5 x 5 mm bearings. The 20 toothed pulley will be pushed up against the first bearing and this will provide thrust support in both up and down directions. The design will bolt into the same position as the current lead screw brackets. I call them my Z towers and I will need both a left and right side version.
    I plan on mounting the single motor shaft down on a plate that will mount to the 20 x60 mm upper extrusion. With four idler pulleys, I can use the motor as the tensioning device on the closed belt. Here is a picture of the right side tower.
     
  6. knabo

    knabo Well-Known
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    I'm not seeing too much z axis variation between the two motors. I check it once a month or so. That being said, a single motor solution that can drive both sides would be interesting..

    Don't see your picture...
     
  7. Craig Anderson

    Craig Anderson Journeyman
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  8. JustinTime

    JustinTime Master
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    Is this some kind of a spam?
     
  9. Craig Anderson

    Craig Anderson Journeyman
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    Here are the pictures
     

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  10. Craig Anderson

    Craig Anderson Journeyman
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    No spam, Photobucket has raised their rates.
     
  11. Craig Anderson

    Craig Anderson Journeyman
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  12. Craig Anderson

    Craig Anderson Journeyman
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    I am having trouble measuring the belt length. It will look like the drawing above.
     
  13. Grantman

    Grantman Veteran
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    What belt will you be running? Pitch will determine belt length around a 20T pulley - 2mm x 20T = 40mm of belt to wrap one pulley. You have 2.5 wraps total - 2.5 x 40mm = 100mm (3.93") of belt plus the total of all your straight runs.
     
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  14. jjcolletta

    jjcolletta Well-Known
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    I just recently converted my dual z to a single z with dual belts and it is working out well. Disregard the outside motors they are not actually coupled, I kept them in place in case this didn't work. I was having issues where the two motors were not staying timed causing serious frustration.

    IMG_0455.JPG
     
  15. Craig Anderson

    Craig Anderson Journeyman
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    How do you tighten your belts? I intend to use a single 1000mm belt with the motor acting as the belt tensioner. Also, I am not sure putting belt tension on the 8 mm shafts is not going to cause vibrations from binding. Let us know how it works.
     
  16. Saint Billy

    Saint Billy Journeyman
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    What quality filament have you guys used for the printed parts? Apologies if this has already been asked.
     
  17. Craig Anderson

    Craig Anderson Journeyman
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    I generally use ABS. I don't like the strength of PLA.
     
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  18. Craig Anderson

    Craig Anderson Journeyman
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    I have now completed both towers, the idler pulley block and motor mount. Waiting on pulleys, bearings and belt.





    019.jpg 020.jpg
     
  19. Saint Billy

    Saint Billy Journeyman
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    Ok thats great, I struggle to notice the difference but have never really printed anything where strength is required so it is good to know.

    Cheers
     
  20. Craig Anderson

    Craig Anderson Journeyman
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    On my first printer I had a direct drive Wade extruder on my machine. It was supposed to be ABS, but whoever printed it used PLA. I took it to a different location and stopped at a fast food and gas station. It sat in the back seat for about 25 minutes. This was in Washington State. When I came out the motor on the extruder seem off and I checked it and it had slumped about 3/4 of an inch and was completely unusable. Fine for a prototype, but really worthless for something that needs lasting strength.
     
  21. Saint Billy

    Saint Billy Journeyman
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    Wow, I didnt realise there was such a difference, thanks for the advice.
     
  22. jjcolletta

    jjcolletta Well-Known
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    I did not get the belts "piano string" tight. I just shifted the z-screw mounts outward till tight enough. Since the pulleys are high I do not have any bowing on the 8mm screws. Here are some pictures of prints i did yesterday. I little bit more tuning but so far so good.

    image1.JPG image2.JPG
     
  23. Craig Anderson

    Craig Anderson Journeyman
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    Looks pretty good to me!
     
  24. Craig Anderson

    Craig Anderson Journeyman
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    I am still waiting on the belt, but the idlers and motor mount are now installed.


    001.jpg 002.jpg 003.jpg
     

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