You can't do that but the recent versions of Cura (3 onwards?) support relative extrusion for those printers that can use it. It's in the special modes section. The Ultimaker people can confirm this but, unfortunately, I do not think that their printers can cope with relative extrusion so if that's what you have it probably won't help.
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gr5 2,295
I don't think so but that's a cool idea.
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