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The extruded filament bead looks very (too) well defined, perhaps extrusion temperature too low or fan too high, causing poor binding between layers and the partial collapse that you have (in several places) on the build. One other poss, z-offset, head too far from bed so poor compression? You don't say what filament type you were using? We've all been there, don't beat yourself up, analyse, adjust and go again. GL