3D print hell, part 17, support Z distance: 0.3mm: part tips off support during printing 0.1mm: zeus himself could not pull off the support
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Replying to @ra6bit @FioraAeterna
That requires the next phase I'm waiting on: nm-scale lithographic printing on silicon.
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Replying to @FioraAeterna @ra6bit
I've thought about whether you could do it radially with a modified bluray drive...
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A friend did something similar, but not nm-scale (just for decorative purposes). You kind of need a patterned surface for tracking though.
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Replying to @marcan42 @RichFelker and
I'm not sure you could sensibly modify a typical pickup to track without a pre-groove to lock on to (i.e. blank disc).
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There might be some other side channel you could track by...?
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As far as I know, without the optical feedback from the pickup itself onto the pre-groove, focus are tracking effectively become open-loop.
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Angular tracking is a problem too (normal burners just don't care except roughly on average). Friend built some FPGA-based PLL thing.
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Replying to @marcan42 @RichFelker and
... which worked fine for visual purposes but for nm-scale tracking you really need some accurate angular feedback too.
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Replying to @marcan42 @RichFelker and
Fun fact: some copy protection schemes, like GC/Wii's, rely on lack of angular repeatability. You can get good enough to fool them though.
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