For any future Spoonflower surface pattern designers, don't bother with mirrored and half-brick repeat. There's no benefit since both require full-scale patterns to be downsized to 30 cm—might as well mirror/half-brick patterns in your art app first.
Believe me, 160 mirrored and half-bricked patterns later, I definitely learned this the hard way and want to save as many as possible from going through what I just went through.
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