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A ridiculously detailed 4th order Hilbert curve in 3D. Two corners are rotated so that the curve forms a loop.Thickness and gaps 1 mm. See https://www.shapeways.com/model/108620/ for a smaller version. I haven't tried this, but since the model half the size printed ok with WSF, I assume this will too. (For some reason this only had two materials... Corrected.)