Both PETG and PLA will show a bit of shrinkage while cooled. This shrinkage rate is much less as compared to other filaments. The shrinkage rate of these filaments when cooled ranges between 0.20-0.25%. The shrinkage of PLA is almost neglible, while PETG does show some visible shrinkage, but not as much as ABS. Comparing other filaments, ABS shrink almost 0.7% to 0.8% while Nylon may shrink up to 1.5%.