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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A friend did something similar, but not nm-scale (just for decorative purposes). You kind of need a patterned surface for tracking though.
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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