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Perimeters are the concentric loops around the outside of each layer of the print. These are basically the bits you see most of - the outside surface of the sides of the print. Some slicers allow you to specify the number of rings of plastic that you want - the instructions were asking you to set a single ring.

Cura measures that in terms of a distance, rather than a number of rings of plastic, and refers to it as the 'shell'. So to get a 'single perimeter' you need to specify a shell thickness equal to your nozzle size - usually 0.4mm on an Ultimaker. In general, you should always set the shell thickness to be an exact multiple of your nozzle size, so that Cura can easily and exactly use a whole number of adjacent passes to make the shell layer.


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