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Solder paste bricks should ideally form crisp, uniform rectangular shapes. Curved tops like "rooftops" or dipping "saddle shapes" signal poor release from the stencil or inadequate paste volume.
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Paste deposits must be centered on the pad. Misalignment generally becomes rejectable when the offset exceeds 20% of the pad width (varying strictly by target class). Solder paste bricks should ideally form crisp, uniform