1, poor melt rheology: POM material has poor melt rheology, which easily leads to stress concentration and deformation during processing. Increasing the thickness will aggravate the stress concentration and lead to more obvious deformation.

2. High thermal shrinkage rate: POM material has high thermal shrinkage rate, and increasing its thickness will lead to uneven internal temperature distribution, which will lead to different shrinkage rates in different parts and deformation in different directions.

3. Uneven cooling rate: Uneven cooling rate of POM material will lead to uneven internal stress and deformation. Increasing the thickness will make the cooling rate more uneven, which will lead to more obvious deformation.