[EMS Discuss] Inkjet-printed circuits?

Tue Nov 12 13:06:08 PST 2013


That the most recent thing I've read on 3d printing with conductive filament.  Apparently they had some success using graphite and silver since both react differently and complimentary. 

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On Nov 12, 2013, at 9:54 AM, Taper Wickel <EMAIL HIDDEN> wrote:

> I've been playing with this myself, on the conductive-ink/paint/glue
> end; with some mixed results.
> *  I've lit LEDs with conductive ink on paper, which is kinda fun. A
> thing to note is that the graphite/graphene based inks are resistive;
> depending on the length/thickness of the trace, you might not need an
> extra resistor for the LED! Also, you can draw potentiometers!
> * I've tried 3-d printing a circuit board for use with the conductive
> glue. The idea I had was essentially a block with little troughs for
> the glue to stay in; push the glue in there, push down the components,
> and voilà. Except it didn't work.  I blame the roughness of the thing;
> next try will have deeper (and a little wider) troughs, and I may use
> a syringe to apply the glue instead of the eyedropper-type applicator.
> * I also want to see if you can incorporate enough graphite/graphene
> into polymorph/shapelock plastic to make it conductive/resistive.
> I've got a big thing of lamp black I picked up at an art store that
> would at least make the plastic black, but I don't know if its
> graphite is in the right form to do conductive.  Thanks for the links
> to RMS Graphite, Sam; that should point me in the right general
> directions.  I figure if this is doable at all, I could make 3d
> circuit structures, and then cover them in normal, insulative plastic,
> and end up with blinky-light plastic objects. Or something.
> Taper.
> On Tue, Nov 12, 2013 at 9:27 AM, Sam Foster <EMAIL HIDDEN> wrote:
>> First, I love seeing published research published freely and openly like
>> this. I've been kind of watching this space for the last couple of years.
>> Its great to see a paper that connects up the dots and proposes a practical
>> and relatively affordable way of making home-printed circuits. The silver
>> ink is expensive however. For simple circuits you can use copper tape (see
>> specialists suppliers like 3M, or just go to the garden center and pick up
>> slug and snail tape - same stuff). This technique is used for some great
>> demos by  Jie Qi http://www.youtube.com/user/qijies/videos
>> For the ink, this guy has been doing some great work on how to produce the
>> kind of nanoparticles and conductivity you need using what he calls "jam jar
>> chemistry" - kitchen/hardware-store chemicals and equipment.
>> http://www.youtube.com/channel/UC4AkVj-qnJxNtKuz3rkq16A
>> He also has set up an online store with some of his graphite and graphene
>> products: https://sites.google.com/site/rmsgraphite/
>> This video has details on making the kind of copper nano-particles you'd
>> need for a conductive ink: http://www.youtube.com/watch?v=oVN9DV1LmSU - but
>> there are others in his collection also. Even if you have no intention of
>> making the stuff, I recommend his videos for rediscovering the simple joy of
>> chemistry in a really accessible way.
>> ..you can of course just buy the stuff - auto stores sell a pen for
>> repairing the heating elements on rear car windows. Electronics supply
>> stores have something similar - that works great. You just draw your traces
>> and with care you can solder to it.
>> I did a quick experiment hooking a button cell battery up to light up a
>> couple of LEDs, where I used copper tape for the traces and sticky tape to
>> handle and secure SMD LEDs to the traces that was delightfully easy and
>> effective. http://www.youtube.com/watch?v=2_IxxMbfQQY
>> I'm currently working on using the same idea for a simple AA powered light,
>> where the circuit, battery holder and structure are all built on a sheet of
>> plastic that can be coiled up and shoved into the top of a bottle.
>> /Sam
>> On 11/11/2013 1:17 PM, Dan Robinson wrote:
>>> Has anyone here read about this? I think this, combined with 3D printing,
>>> is going to mean innovative electronics will soon make a quantum jump, for
>>> better and worse. At least when we can 3D print with several materials in
>>> one step, as with 2D color.
>>> http://www.kurzweilai.net/how-to-inkjet-print-circuits-at-fraction-of-time-and-cost?utm_source=KurzweilAI+Daily+Newsletter&utm_campaign=66ba2bb6f8-UA-946742-1&utm_medium=email&utm_term=0_6de721fb33-66ba2bb6f8-281953809
>>> Dan
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