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Wednesday, November 23, 2011

Fwd: [thingiverse] fast cure plastics & 3D printing



---------- Forwarded message ----------
From: Jordan Miller <jrdnmlr@gmail.com>
Date: Wed, Nov 23, 2011 at 12:10 AM
Subject: Re: [thingiverse] fast cure plastics & 3D printing
To: thingiverse@googlegroups.com


The future is closer than you think... just use lasers, no sharks required.

Can't wait for the LaZerBot :-D

The commercial perfactory systems are $130,000 or so. These new homemade versions are less expensive than a Thing-o-Matic!

http://www.instructables.com/id/Build-a-Laser-3D-Printer-Stereolithography-at-Ho/
http://www.robhopeless.com/
http://3dhomemade.blogspot.com/

Photocurable resins are more expensive but they also provide the highest possible precision/resolution because its photolithography.

on each of the other points, i have slight experience with a couple of these FWIW:

1) for electrospinning or really electrospray is what you want i think, the size of the particles is easier to control than where they go (they go absolutely everywhere). you'd need a highly highly focused electrical ground to serve as the catching focus. very difficult. usually people just use a 4" square plate, but it catches particles even on its backside. electric fields are crazy but i love them.

2) piezo oscillators are hard to make go perfectly up/down for cheap. a buddy at the hackerspace made one last week with some audio transducers and a perfect tone generator but the vibrations tend to have slight lateral motion at the nozzle which causes particles to eject sideways sometimes. But that was only a $15 setup. =D

jordan





On Nov 22, 2011, at 9:55 PM, Zach Smith wrote:

> This would be an epic undertaking, and a successful device would be a contender for dominant 3D printing technology for the rest of the decade.  I'll have a prototype next weekend.  ;P
>
> Seriously though, this would be a massive technical project.  It's taken the community years just to master heating and squeezing plastic through a hole, hehe.
>
> Zach
>
> On Wed, Nov 23, 2011 at 10:27 AM, Mark Ungrin <Mark.Ungrin@gmail.com> wrote:
> On 22/11/2011 8:25 PM, Zach Smith wrote:
> > This is a really cool idea.  I like the mental image of a block rising
> > in the Z plane with an object coming out the bottom.  :)
>
> Exactly!!!
>
> I like to think of the spray coming out of the spray gun as containing
> any 3D model you might want to print - with all the holes filled in :)
>
> It's just a question of figuring out how to turn it off in the right
> spots to make the holes. The tricky part would be a dispenser that
> doesn't cost a million bucks to make with all those channels. There's
> probably a way to do it using microfluidics, or maybe a bunch of used
> commercial printer cartridges clamped together...
>
> A related idea in that direction - I wonder if this would work:
>
> 1) small diameter, decent flow rate pre-polymer injection port from a
> pressurized reservoir - electrically charged - c.f. electrospinning
> (https://secure.wikimedia.org/wikipedia/en/wiki/Electrospinning) and
> flow cytometry
>
> 2) piezo or other oscillator on it to break the stream up into droplets
>
> 3) droplet stream passes between charged plates salvaged from an old CRT
>
> 4) steer droplet to target just like steering electrons in a CRT
>
> 5) cure either chemically (Styrocoat) or UV etc on impact (you're now
> far from the nozzle so should avoid clogging issues)
>
> Then you tune pressure and oscillation rate to get nice droplet
> formation and separation, and vary the voltage on the plates to draw
> your object. Multiple nozzles would be fine so long as they're separate
> enough not to interfere electrically, giving multiple materials on a
> drop-by-drop basis (e.g. build / support, hard / elastomeric, red /
> green / blue etc). The nice thing is there are *no* moving parts, it's
> all solid state.
>
> Thoughts?
>
> Mark
>
> --
> Go visit thingiverse at http://thingiverse.com and stay tuned to the blog at http://blog.thingiverse.com.
>
> You received this message because you are subscribed to the Google
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> To post to this group, send email to thingiverse@googlegroups.com
> To unsubscribe from this group, send email to
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> For more options, visit this group at
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>
>
>
> --
> Zach Smith
> Chief Product Officer
> MakerBot Industries
>
> --
> Go visit thingiverse at http://thingiverse.com and stay tuned to the blog at http://blog.thingiverse.com.
>
> You received this message because you are subscribed to the Google
> Groups "thingiverse" group.
> To post to this group, send email to thingiverse@googlegroups.com
> To unsubscribe from this group, send email to
> thingiverse+unsubscribe@googlegroups.com
> For more options, visit this group at
> http://groups.google.com/group/thingiverse?hl=en

--
Go visit thingiverse at http://thingiverse.com and stay tuned to the blog at http://blog.thingiverse.com.

You received this message because you are subscribed to the Google
Groups "thingiverse" group.
To post to this group, send email to thingiverse@googlegroups.com
To unsubscribe from this group, send email to
thingiverse+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/thingiverse?hl=en



--
http://www.google.com/profiles/technologiclee

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