[nwiswell]

You'd spend far more than 6400 euros to do it at home.

If you did it often and didn't count your own labor costs, then maybe the average cost would be less, but that's an incredibly specific situation.

> I believe the way Sam Zeloof circumvents the enormous amount of capital needed for a chip fab by relying on modern technology to create 1970’s technology

Yes, exactly.

Old lithographic technology is so crude that you can even use modern high resolution laserjets to print masks (10000 dpi is less than 3 microns).

Even so, 1970s-era CVD, PVD, and plasma etch is still quite complicated, and CMP is impossible (it hadn't even been invented yet). So the devices you can create are significantly integration-constrained.

[_Microft]

Do you have examples for models of laser printers can actually achieve a resolution of 10000dpi? It doesn't need to be office equipment. Any example would suffice as I so far thought that laser printouts were limited to a maximum resolution between 1200 and 2400dpi.

[nwiswell]

Not at home, but at professional printing houses absolutely.

This isn't hypothetical, I've done it -- in grad school we would send out (I believe) 30000 dpi print jobs on transparent polyester film, and then adhere those to glass blanks to create cheap masks for MEMS fabrication. We had an old Canon i-line lithographic aligner that accepted the glass blanks.

I think the print jobs cost us about $100 each.

Here's the first Google result for a vendor (I don't remember who we used). There's a price list on their page and it looks like they have capability up to 50,800 dpi.

https://www.fineline-imaging.com/plotting_services.shtml

[xw38011]

If you're willing to go 10um then it's even easier and one can use a DLP to go maskless.

https://hacker-fab.gitbook.io/hacker-fab-space/fab-toolkit/p...