[mwcz]

The timing of this share is crazy, since I was just looking around a few days ago to see if there were any guides or even kits for doing photolithography at home. It's part of my mission to demystify modern technology for my kids. I couldn't find anything, so this is excellent to see. Far too complex for my kids ages, but it might be cool to replicate at least part of this amazing project when they're older.

[bpye]

There is a great video on creating lithographic masks on Ben Krasnow's Applied Science channel - https://youtu.be/YAPt_DcWAvw?si=RXaS-GY7czqo_TJZ

The photographic steps are pretty accessible.

[jcims]

Was just going to post this. Ben's channel is a treasure trove.

[mwcz]

Wonderful, thank you!

[alted]

The Hacker Fab [1] project at Carnegie Mellon is creating and publishing guides to building simple fab equipment including photolithography and a sputtering system. For somewhat more complex equipment, I appreciate [2] from the founders of InchFab [3].

But maybe the easiest way to do (very low resolution) photolithography at home is to use dry film photoresist, which is like tape you can stick onto a copper PCB you then expose and etch; a cheap roll is ~$20 from eBay/Amazon.

[1] https://docs.hackerfab.org/home [2] https://dspace.mit.edu/handle/1721.1/93835 [3] https://www.inchfab.com/

[junon]

They also have a discord server that seems pretty healthily active (I'm a long time lurker)

[Joel_Mckay]

Cyanotype Paper is safe fun for kids to try Sun printing silhouettes.

Another project is growing large salt crystals in saturated solution.

The Unitech Electric Static Wand Toy off amazon was also popular last year (poorly built mini Van de Graaff generator.)

Glow in the dark wall paint and a 5 second strobe light is also a classic silhouette demo.

Could also look for linear polarizing sheets, thermochromic sheets, and "Magnetic Viewing film".

Some will like this stuff, others only want to stare at a screen. =3

[adrianN]

It’s fairly easy to make cyanotype yourself: https://simplifier.neocities.org/cyanotype

[mwcz]

Thank you, those are some awesome ideas. We've tried about half of them, but the rest are going straight on the list. Much appreciated.

[duped]

Silk screen printing is probably the easiest way to introduce the concepts to kids. There are a lot of maker spaces/artist collectives and classes that have the basic tools and resources to do it.

[snek_case]

You could also try to replicate something like the Monster 6502: https://monster6502.com/

It's not lithography, but you can build a working processor out of small surface mount chips, and you can solder these chips with lead-free solder. That seems very achievable for a motivated engineer, and probably involves much less toxic chemicals?

[semi-extrinsic]

Or even gel plate printing, where you get to build multiple layers, one of them being a laser printed photo that is used as a resist.