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"noyau" translates as "core" and "empriente" as "mold" in this context.

They are pieces of the molds required to make the lenses from transparent sheets using a heat gun. You print "empreinte lentille" and "empreinte hublot" and set them down. Place your transparent sheet on top of them and then heat using a heat gun. Then one at a time, using "noyau lentille" and "noyau hublot" respectively, press down on the "empreinte" pieces to form the lenses. Cut off excess to make them round.