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[–] 12 points 1 week ago (7 children)

You could probably invent something like this that's not a cast, just an arm accessory holder sleeve thing. The cupholder would need to rotate for horizontal and vertical orientation probably

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  • [–] 8 points 1 week ago (2 children)

    the cupholder needs to be gryoscopic, so it always points up due to it's own weight.

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