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  1. #1
    Student rpopeye's Avatar
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    My 3D printed electromagnetic BB gun

    It's entirely 3D printed, took me about a year to design and build on my Turnigy Fabrikator.
    Because the size of the printing area 15x15x10 cm of my Fabrikator is much smaller than the size of the whole thing, I had to glue together the different parts, which in this case was quite challenging, because very tight straightness tolerance was required. To achieve this I used an aluminum beam as reference.
    The finished electromagnetic BB gun looks not only cool, but it's also fully functional and basically as good as a normal CO2 powered BB gun.
    https://youtu.be/jhtAsYy7dgM
    IMG_4982_small.JPG

  2. #2
    Super Moderator Roxy's Avatar
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    Very cool!

  3. #3
    Technologist Roberts_Clif's Avatar
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    Add Roberts_Clif on Thingiverse
    I would like to know more about this electromagnetic BB gun.

  4. #4
    Super Moderator Roxy's Avatar
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    Yeah... I would like to see the circuit and how the BB's automatically feed into the accelerator.

    I would like to see a tear down of it...

  5. #5
    Very impressive...

  6. #6
    Student rpopeye's Avatar
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    Thanks, guys, much appreciated!
    The electronics circuit is pretty standard - a series of coils along the barrel are switched on and off in succession, which attracts and accelerates the steel BB.
    Every coil is controlled by the circuit below. The control signals for each coil circuit are generated from an MCU. The coils are powered from a high voltage capacitor bank, which in turn is charged up from a battery by means of a boost DC-DC converter. The BBs are loaded by a standard servo with a disk attached to its horn. The servo first turns to 0 degrees to get the BB from the top of the clip, then turns to 180 degrees and positions the BB right in front of the barrel - hence the servo noise between shots.
    circuit.jpg

  7. #7
    Super Moderator curious aardvark's Avatar
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    very neat.
    Could you make it smaller ?

  8. #8
    Student rpopeye's Avatar
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    yes, it is possible, the bulk of the size comes from the capacitor bank, by tweaking the electronics and reducing the size of the capacitor bank it would be possible to reduce the total size, but not much, perhaps 20-30% at most. To reduce the size further will require some radical changes in the electronics to compensate for the reduced energy in the capacitor bank.

  9. #9
    Student rpopeye's Avatar
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    Here is a picture of the interior, the rest of the volume is pretty much filled with capacitors
    IMG_4587_small.jpg

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