Gshep3 Hi @sqlpkev I'm not sure I totally understand your question, are you asking how Shapeways knows which dimensions to use? If so, Shapweayws takes the dimensions of the 3D model you upload to them, and when doing so you can specify which unites the object was designed in (eg. mm or in). Does this answer your question? If you're looking for the exact dimensions of this product, they are:
Material thickness: 1mm
Upper lip OD: 25m
Upper lip ID: 23mm
Lower cylinder OD: 11mm
Lower cylinder ID: 9mm
Lower cylinder height: 5mm
Total height: 17mm
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