A template for (real) parabola reflectors. Print on A4 white sticker. Glue on foam core board (3mm). Cut the outline with a knife and make just a slit on the shape of parabola. Cut 2 large strips of sheet metal with a width of 5 cm from a large coffee box and pass them through the slit of the parabola after adjusting the length ~ 9.15cm (a small scissors for copper-sheet metal helps). Stick with cyanocrylate. In a short time and with little money you have parabolic reflectors (mavic mini). Diameter 8 cm, focal depth 1.33 cm.
