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The slug reduces the pretravel to nearly zero
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At sensible speeds, this surely does not matter
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Both pairs of motors turned in the same direction
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I have Real Plotter Pens, dammit
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The Navy saved them plenty of trouble and inconvenience
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One end of the twisty tube got really really hot as it failed
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It spits out bits an order of magnitude faster at 6 μs/bit
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It dissipates 450 mW, raising the temperature enough to let the PWM control kick in
The Smell of Molten Projects in the Morning 