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Triangular drill
submitted
10 mos ago
by
throwschen
to
interesting
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joseph
10 mos ago
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People seriously amaze me. How would one have even discovered this shape would do it, let alone how to make the blade work?
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coffeeislife
10 mos ago
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Lots and lots of math would be my guess
joseph's comment on Triangular drill | SpeakBits