Spyke

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What cheap setup or technique works for truly flat photos for use in CAD?

Flatbed scanner, as someone else said, would be best.

For a camera take the photo with the highest focal length you can (biggest zoom lens on your phone). Fill the frame as little as possible (distortion gets worse as you get closer to the edges). Both GIMP and Photoshop have filters to remove lens distortion. It would help to put two straight edges, (one horizontal, one vertical) near the edges of the photo. When you remove the lens distortion properly these lines will become straight.

You could also try photogrammetry to get a rough model to use as a reference.

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Please put your money where your mouth is.

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Ultra Lifetime is arguable but as I understand it, it's not that easy because Google Play doesn't have a way to transfer subscriptions between apps like that.

Pro I don't think makes sense because it was pretty cheap to begin with. Pro ended up costing me $0.00062/day ($2.50 11 years ago). Kind of makes me feel guilty to be honest.