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Tuck a neatly laser-cut disk into a flimsy cardboard tube: Put a big conical center in the tailstock: Whereupon the tube remains nicely tubular on both ends and aligned along the chuck axis: Which is why you save all that scrap material … Yes, it’s the core from a toilet paper roll, which is way…
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A little flush-cutter action made that problem Go Away
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The thin, deeply drawn aluminum tends to crack after a while
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What goes into making it work
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Fiddling with the 3D printing parameters might make it more transparent
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They’re also test pieces for the whole transparency thing
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Squirrels apparently just ignore the sharp ends
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I jammed a small prydriver into the gap
The Smell of Molten Projects in the Morning 