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Wax printed PolyDiMethylSiloxan (PDMS) models: (a) half cross-section model set in PDMS using a Lego mold; (b) full cross-section model before wax was removed using acetone; (c) completed half cross-section model; (d) completed full cross-section model; and (e) defects seen in PDMS model of stenosis case one. Full design rationale and dimensions used to design the models are included in detail in Section 4.1.
