Model RR Applications with this

[Bob Bufkin]

http://vidbook.me/this-pen-can-draw-working-electronic-circuits-on-paper-with-conducting-ink

[Cory Rothlisberger]

Endless... 

[ryan_wilkerson]

Isn't this similar to the currently available CircuitWriter? It's about $20.
I have a HO modeller friend who uses it to connect a resistor to the metal wheels on every rail car on his layout so his CTC signals can see occupancy. I haven't tried it myself.

That's a cool ad. If this is silver, wouldn't it get very expensive in quantities they show in the video?

[Ngineer]

It is a japanese company called AgIC. (= Silver integrated circuit)

https://agic.cc/en/

The pen is called Circuit Marker. I have no idea if and where it is available.

Caveat: "Circuit Marker draws up to 40 meters. This marker is compatible with only AgIC Circuit PET Film and Circuit Paper."

   Javier

[drgw0579]

I use the CircuitWriter pen for making resistor wheels,  maybe this new product uses more of an ink?  There are cheaper sources of conductive paint but I wrote the process up here: http://cmrm.org/NewsLetters/CMRM-2016-07-July.pdf

Bill Kepner

[ryan_wilkerson]

Great writeup Bill! Thanks for sharing it.
-Ryan

I use the CircuitWriter pen for making resistor wheels,  maybe this new product uses more of an ink?  There are cheaper sources of conductive paint but I wrote the process up here: http://cmrm.org/NewsLetters/CMRM-2016-07-July.pdf

Bill Kepner

[peteski]

Conductive paint/ink (silver, nickel and carbon based) have been brought up several times in the past.

https://www.therailwire.net/forum/index.php?topic=33236.0
https://www.therailwire.net/forum/index.php?topic=35044.0
https://www.therailwire.net/forum/index.php?topic=36936.0
https://www.therailwire.net/forum/index.php?topic=37936.0

There are probably more examples - I just did a quick search.