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Keep your powder dry!

Discussion in '3D Printing Design, CAD, Modelling, Filament, etc.' started by Redbrickman, Dec 10, 2018.

  1. Dec 10, 2018
    Redbrickman

    Redbrickman Printer Master

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    The Hat likes this.
  2. Dec 10, 2018
    The Hat

    The Hat Printer VIP Moderator

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    Nice one, so you don’t have to take all the reels, just to replace an empty, my single shart system is already up and running but I’ll look further in this guys idea, because it has merits..
    Thanks @Redbrickman...
     
  3. Dec 10, 2018
    Nifty

    Nifty Printer Master Administrator

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    That's a pretty cool design!

    I need to figure out what's going on with my dry box since the filament is binding in the bowden tube and results in under extrusion :(
     
  4. Dec 10, 2018
    The Hat

    The Hat Printer VIP Moderator

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    This just might be what you’re looking for...
    I am seriously thinking of remodeling my box...
     
  5. Dec 10, 2018
    Hector Vilches

    Hector Vilches Printing Ninja

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    Could also be the PTFE tube getting old/dirty/deformed?
     
  6. Dec 11, 2018
    The Hat

    The Hat Printer VIP Moderator

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    Dry Box.png
     
  7. Dec 11, 2018
    PeterBJ

    PeterBJ Printer VIP Platinum Printer Member

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    I think that if the filament bends where it enters the Bowden tube this will cause friction. I think a tangential arrangement like this would be better:

    Box 2.jpg
     
    The Hat likes this.
  8. Dec 16, 2018
    Nifty

    Nifty Printer Master Administrator

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    I'm still troubleshooting. Not sure if it's the PTFE tube, the kink in the filament, the orientation of the spool and/or the dry box, the length of PTFE, etc. etc. etc.

    I will say that Peter's drawing is closer to what I found works. My first attempt was with the line more in the middle, like The Hat's drawing, and that resulted in the filament buckling, especially with a full roll.
     
    PeterBJ likes this.
  9. Dec 16, 2018
    The Hat

    The Hat Printer VIP Moderator

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    @PeterBJ drawing does work ok for a while but when the reel gets half way thought then the problems can start, (Direction change) that’s why I suggest using a longer piece of tube that will bend in the direction of the oncoming filament..
     
  10. Dec 26, 2018
    The Hat

    The Hat Printer VIP Moderator

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    I’ve been looking further into the problem of drag on the filament as it feeds into the extruder, I noticed that I’m getting a different laydown filament pattern when the extruder has to pull the filament a little bit harder sometimes.
    Untitled-1.jpg Click to enlarge..
    Instead of using a centre shaft to hold the filament in the dry box I’ve decide to go for the idea that @Redbrickman posted in an earlier thread, I will also be using bigger outlet holes in the side wall to prevent filament drag from occurring as already discussed.
    Capture 2.png

    I tend not to babysit my 3D printer but when I do I get all sorts of new ideas to help make it run smoother, some of the stuff I use doesn’t always improve my work flow but that doesn’t stop me trying other ideas, My filament has about 1 metre to run after it leaves the reel to get to the extruder.
     
    PeterBJ and stratman like this.

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