Re: [Phys-l] 3-d printer

[Roger Haar <haar@physics.arizona.edu>]

Hi,

	Variants of these for prototyping have been around for at 
least 20-25 years.  Early ones used a resin which solidified 
with laser light.  The laser would scan over the area and 
then the platform would drop down. The laser would scan 
again creating a new solid layer.  Repeat.

	Jay Leno has a utube video on making replacement  car parts.
http://www.youtube.com/watch?v=ggvzcGdZsTc

Thanks
  Roger

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On 7/15/2011 1:19 AM, Marty Weiss wrote:
> Hi all,
> 	The latest "wow!" video making the rounds on the internet recently is the 3-d printer clip on YouTube and other internet vid sources.  In case someone hasn't seen it... a narrator takes us into a lab where the "inventor" shows the process whereby he takes a wrench, scans it in a new type of scanner, puts the printout into some sort of 3-d printer (after coloring the adjusting mechanism red) which contains some sort of "resin"material and after a few minutes the narrator reaches into the pool of "resin" and out pops a copy of a real working wrench with a red adjustment gear.  The copy does the same job as the real wrench.
>
> The narrator is a "real person"... a PhD and astronaut (at least according to several articles I Googled), but the whole thing has to be an elaborate hoax.  Either that or it's the biggest invention since the light bulb.  If it is a hoax, I have yet to see anyone write about it on any discussion group, on YouTube, or other news source.  Likewise, a real invention such as this would have been heralded throughout the scientific world by now.   Anyone have any explanation or comments?
>
> Marty
>
>
>
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