Conductive ink circuit experiments

This glowing LED is proof that the experiments [Nvermeer] is doing with conductive ink are working. We’re filing this one as a chemistry hack because  you need to hit the lab ahead of time in order to get the conductivity necessary for success. He reports that this technique uses a copper powder suspended in an epoxy intended for spray painting. Before mixing the two he etched the powder in ammonium persulfate, then washed it in deionized water which made it a much better conductor.

We gather that the ink was applied with the brush seen in the photo. But since this uses that spray paint friendly solution to host the copper powder we wonder about stenciling with something like masking tape in order to spray the circuit paths onto the substrate.

There’s not too much info up yet, but [Nvermeer] does link to one of our other favorite conductive ink projects.

Zinc sulfide glow power at home

Further solidifying her mad-scientist persona, [Jeri Ellsworth] is making glow powder with household chemicals. When we saw the title of the video we though it would be fun to try it ourselves, but the first few minutes scared that out of us.

To gather the raw materials she puts some pennies in a bench motor and files them into powder. From there it’s trial and error with different cleaners and tools to create just the right dangerous reaction to get the chemical properties she’s looking for.

Check out her experiments after the break. And if you find you’re wanting more, go back and take a look at her EL wire fabrication process.

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3D laser printer

Working with easy replication in mind, [Peter] is building a 3D laser printer. The majority of the machine is made from laser-cut acrylic held together by parts that are inexpensive and available at your local hardware store. In the end this will lay down a layer of powder, use a laser to fuse the powder together in the outline of your choice, then repeat. This is known as selective laser sintering which is sometimes used in commercial rapid prototyping and, like a lot of other cool technologies, came into existence as a result of a DARPA project.

Sorry folks, this is not a fully functioning prototype yet. [Peter] is searching for the right laser for the job and a source for the powder. If you’ve got a solution please lend a hand and let’s see this project through to completion.

Cyclonic dust seperation

[Don] was having issues with dust when working with MDF. He had a shop vac overheat and die because of it. When looking for solutions, he saw several systems that used cyclonic dust seperation. Not wanting to buy something he could make for cheaper, he left the store and started scrounging parts. You can see his home made system in the video above. This seems like an absolute must have item for any workshop. Great job [Don].