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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Angular tracking is a problem too (normal burners just don't care except roughly on average). Friend built some FPGA-based PLL thing.
... which worked fine for visual purposes but for nm-scale tracking you really need some accurate angular feedback too.
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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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This applies to professional pressed discs too (mastered with professional LBRs). Angular tracking doesn't need to be very good by design.
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PLL with a small number of feedback markers and high quality OCXO might suffice?
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The tricky bit I guess is that you need a high angular feedback frequency to compensate for mechanical instability.
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