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Bi-Motion Box Printer

Discussion in '3D printers' started by Keith Davis, Sep 7, 2017.

  1. Keith Davis

    Keith Davis Master
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    Keith Davis published a new build:

    Read more about this build...
     
  2. JustinTime

    JustinTime Master
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    I had bad experience with these linear bearings. I used both cheap Chinese ones and more expensive US bought ones and the failure rate on both batches was horrendous. 50% or more. I used the 8mm ones. Maybe the bigger ones are better.
     
  3. Keith Davis

    Keith Davis Master
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    I think you would probably experience failure with using linear bearings in place of rotational bearings if the bearing was was being used to position the linear rod. In this usage the rod's position is defined by regular bearings at both ends and the linear bearings "allow" rotation while carrying the weight of the center rods and extruder. I actually use 45mm long bearings (although the drawing shows only 25mm ones) that have the ball rows in a spiral instead of straight lines.
     
  4. Rob Xaos

    Rob Xaos New
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    I like this elegant and solid design. I will very likely use it as inspiration for a build of my own.

    Some suggestions:
    I would double up on both pink rods (I'm a rigidity advocate)
    I would mount the drive motors at the top and directly couple them to the yellow fuscia rods. Although that would not be as visually tidy as your design it would eliminate a number of moving parts.
     
  5. Burning-man

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    sorry for my lack of knoweldge, but what software did you use to build your printer? and where can you find a dual extrusion hotend like in your picture?
    Thanks
     

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