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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There might be some other side channel you could track by...?
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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... which worked fine for visual purposes but for nm-scale tracking you really need some accurate angular feedback too.
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