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1670RE: [diy_3d_printing_and_fabrication] Re: Greetings, and extrusion

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  • Boman33
    Feb 1, 2011
      The syringes pressurized by air are hard to accurately control. The rigid
      syringe ought to be able to control the dripping by slightly backing up the
      plunger but obviously there cannot be any slop or play in the system.

      From: telmah Sent: Monday, January 31, 2011 17:01
      --- <boman33@...> wrote:
      > Welcome!
      > How about a rigid oversized syringe with the plunger CNC controlled. All
      metal or other stiff material. No pipes or hoses to flex. Nozzle directly
      > When low, it could be automatically refilled from a side port with
      > pressurized material to avoid any air pockets.
      > Bertho
      The pressurised syringe pushed by a linear stepper, was the first thing that
      other people have tried. Suffers from dripping...
      They switched to using pressurised syringes (this is what is commonly used
      for things like epoxies), better, but still drips. Hence the need for a
      positive cutoff close to the needle.
      Best Wishes
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