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Re: [Homebrew_PCBs] RE: Re: The EX 3D PCB printer

2013-11-17 by Stefan Trethan

I do agree but kept my mouth shut since I also doubted the viability of Reprap and now you can find a 3d printer on every desk.
The machine sold may turn out expensive junk, but is direct conductor deposition really a dead end? I'm not so sure..

ST

On Sat, Nov 16, 2013 at 10:09 PM, <andrewm1973@...> wrote:


>> andrewm wrote:

>> Like most snake oil it will cost as much as
>> suckers are willing to pay.


> Steve wrote:
> Secondly, Andrew, can you be more specific?

It is a method that has been around for a long

time (Silver Nitrate and Absorbic Acid).


Mostly everyone else gives up on it when they

hit its limitations.


The deposited silver has very high resistance.

We are not talking about the resistance diff

between copper and silver here. The individual

particles of silver have "contact" resistance

between each other. It is orders of magnitude

higher resistance than copper.


You can not do ANY circuit that carry a

reasonable amount of power.


The print resolution is actually below what you

can do with TTS and not even on the same

page as photo techniques. They can manage

an SO package. They can't do a TSSOP let

alone a 0.5mm DFN or less.


It's only marginally solderable.


If they where marketing it as "A novel toy

to experiment with and one day this

technique may give useful results" I would

not call it out as snake oil.


It's the fact that they are marketing it as a

turn key solution to all your problems with

PCB making. When in actual fact there

are not problems with peoples home PCB

making techniques.


These things are going to end up as 1K5

paperweights that rob people of hours of

their life in attempt to get useful results.




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