Optical scanning inspection train.
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Previously:
https://www.homemadetools.net/forum/...559#post147398
https://www.homemadetools.net/forum/...430#post146810
https://www.homemadetools.net/forum/...771#post136877
https://www.homemadetools.net/forum/...777#post136901
https://www.homemadetools.net/forum/...332#post131191
https://www.homemadetools.net/forum/...875#post102727
https://www.homemadetools.net/forum/...976#post137677
https://www.homemadetools.net/forum/...708#post133110
https://www.homemadetools.net/forum/...1740#post75040
