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Eh, I'm not sure about that. I have an Invisalign retainer and have been 3d printing for a few years now, and from the looks of it they just did a regular FDM printing of the teeth then vacuume-formed plastic over that. Having printed the same files myself (dentist was happy to give the scan to me), and seeing as the retainer has very visible layer lines on the inside (too thick for resin printing), that seems more likely.

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