Good question. Is any resolution lithography reducible to hobby scale? Like say micrometer scale? I suspect not because of the weird toxic chemicals involved
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5 nm is for the corps. I’ll take even mm scale for home fab, which would be 1e6 bigger in linear dimension (1e12 planar?)
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I would settle for insanely large Shrinky-Dinks that somehow concentrate metallic marker inks enough to conduct
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Complex but possible:
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New homemade silicon chip - array of 100 transistors
sam.zeloof.xyz/second-ic/
youtube.com/watch?v=IS5ycm
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why would one want to fabricate silicon blocks other than just for curiosity about the process ?
custom hardware blocks can be done with fpga
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