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My “stacks” are nothing compared to the Bad Old Days
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They were not going to become any color I would recognize as green
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Whereupon the tube remains nicely tubular on both ends
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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
The Smell of Molten Projects in the Morning 