We get a lot of questions about this actually. We use about 7/8ths of the nozzle size in Ultimaker's printers because adjacent lines tend to adhere better together then. Because the nozzle is a bit wider, the adjacent line gets partially printed on top of the previous line. 7/8ths of the nozzle size seems to be the sweet spot (so we also use 0.7mm lines for 0.8mm nozzles). This works completely different for different nozzle designs, so if you have a different sort of nozzle then the s
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