Nema 14 BMG direct extruder

Discussion in 'Tool heads & ToolChanger' started by Micked, Dec 3, 2019.

  1. Micked

    Micked Member

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    I just wanted to share a toolhead I've been working on for little while:

    2019-12-03-184418_600x758_escrotum.png

    It's a bit of a mish-mash of things I had on hand, but it's a direct drive extruder using the gears from a Bondtech BMG, a Nema 14 stepper motor, a cheap Ender-3 style heat-sink and an E3D heatblock and nozzle.

    I guess it's a lot less relevant now with the Hemera out, but I still wanted to share it.

    IMG_20191128_214718_.jpg IMG_20191130_165251_.jpg IMG_20191126_213744_.jpg IMG_20191203_182540_.jpg IMG_20191203_182807_.jpg

    STLs: https://www.thingiverse.com/thing:4018910

    Onshape source: https://cad.onshape.com/documents/c...870d233f3a57f6809d/e/664857bb189496ec65c3a787
     
  2. AngelCrusher

    AngelCrusher New Member

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    Really nice! I think you have something there - that's lightweight. What nema14 did you find that's adequate?
     
  3. Micked

    Micked Member

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    Thanks! It's a 28 mm from here (14HS2812)

    The holding torque is reported similar to the Nema 17 pancake motors. I don't know what that means in dynamic applications, but so far it seems to be just about enough.
     
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  4. Micked

    Micked Member

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    Some updates on the performance:

    - As an extruder for flexibles which was the main design goal it is an absolute champ. Not quite PLA-settings-and-go, but I have an old roll of generic TPU that I have never been able to use in either BMG+V6 or Titan Aero which it is extruding without problems.

    - For multi material prints it did fail with a nozzle clog however. I attribute this to the heat creep in the inadequate hotend heatsink. I'll try a longer motor or perhaps consider how to fit a V6 or buy a Mosquito.
     
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