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pen shaking centrifugeThere's nothing more frustrating than trying to write with a pen that's out of ink – except trying to write with a pen that you know has ink in it but won't write anyway.

You lick it, shake it, introduce it to other functioning pens with the hope that your pen will be inspired. Sometimes it works but sometimes it doesn't.

This element of uncertainty just wasn't acceptable for woodworker Matthias Wandel, so he came up with a surefire way to get the ink flowing again. He built a pen-shaking centrifuge.