Fibonacci Spiral

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This is part of a series of 30 exercises developed during the E3D+VET program, designed for immersion in 3D printing at VET centres (website: https://www.e3dplusvet.eu/).\n\nThe model consists of ten independent pieces. The first two pieces, the smallest, are quarter circles with a radius of one centimetre each. The third piece has the same shape but a radius of two centimetres, the fourth three centimetres, the fifth five centimetres, and so on, continuing the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13, 21) up to the last piece with a size of twenty-one centimetres. The spiral pieces that make up this model are held in place by a rectangular back support printed in 3D and divided into two halves. This support has a recess of seven point five millimeters to allow for better positioning of each piece.