Nottinghack Big Wheel

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On my most recent trip to Nottinghack I cut and installed a big wheel to go under their laser cutter. They had been making do with the original design with just the wavy edge (not a lot to grip onto), which was cut onto a sheet too small and had a flat spot and was loosely held in by normal nuts so kept slipping. Hopefully they'll appreciate this one when they realise how much easier it is to do it this way.
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