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Thickness analysis.

in General
Answers
https://www.onshape.com/en/blog/thickness-analysis
if you're on the standard plan, sadly this is not available. :-( (i.m.h.o. it should be, this is standard CAD analsysis stuff). In that case there's a custom feature by @MichaelPascoe :
https://cad.onshape.com/documents/55e98155dca4ba4e8049a18d/w/dbf02fb86aafef13f08be126/e/67100c66e805cdf37822750a?renderMode=0&tangentEdgeStyle=1&uiState=684ff1f95854d0479d7932da