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The inside edge of the Mini has a slight valley in it. I folded a piece of paper around the outside and traced inside this valley border with a pencil and cut the stencil. Then I printed out a 8×10 picture.

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I taped the stencil and cut the picture. Not rocket science. The inside valley is what made it accurate.

Printed on plain paper. Looks ok for what the hack it is. Will probably fall apart in two weeks. Or my cat will eat it.