Why does low shrinkage matter on large flat parts?
Because the build plate is where a cheap roll fails. PLA that keeps shrinking while it cools pulls the base upward at the corners and bows a bed-sized panel, and two parts printed from the same file can come off the plate at two sizes, which breaks any assembly they belong to. This grade is a low-shrinkage, low-warp formulation, so a large flat panel stays down and repeat parts stack the same way.
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