Use a mandoline to julienne the zucchini (3 medium size) into 1/4" strips.
Sprinkle them generously with salt and toss to ensure they're coated. Place them in a colander and allow them to sweat for 15 minutes.
Meanwhile, combine whole milk ricotta (1 cup), grated parmesan (1/2 cup), crumbled feta (3/4 cup), dried oregano (2 teaspoons), egg (1), and salt (1/2 teaspoon).
Once the zucchini has finished sweating, rinse with water, and place ribbons in a clean dish towel. Carefully dry the zucchini.
Form the raviolis by overlapping zucchini ribbons to form an 8 point star (see photos above).
Place about 1 tablespoon of filling in the center of each zucchini.
Wrap the edges of the zucchini over the filling.