Kevin Flynn's left wrist cuff has a very detailed graphic, and upon careful observation, I determined that it fastens on the bottom. Here are the screenshots I went by for digitizing the graphic and cutting the cuff to shape:
I used 2 sheets of thin craft foam, wrapped around an aerosol paint can and superglued. This creates a bias curvature to the cuff. I then cut the cuff to shape and riveted in the snaps. Next, I painted it with flat white enamel, and adhered an inkjet printed vinyl of the graphic. The paint is necessary, as the vinyl won't stick to the foam, but will stick permanently to the paint. Here are the pictures of this detailed build process:
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