Question

Why does shrinkage occur in 3D FDM printing ? explain 2 approaches to reduce shrinkage for a given component geometry

Answer 1

For 3D printing we use mostly two types of plastic one is ABS and another one is PLA. ABS is stronger and slightly flexible, while PLA is biodegradable and comes in nicer colors. But there is one more very different characteristic: shrinkage When we cool ABS after printing it shrinks approximately 8%, although this will vary somewhat depending on the particular ABS in use. PLA has far less shrinkage. This is we will not get specific sizes of the objejct due to shrinkage. A 50mm print might actually be 46mm instead.

While PLA shrinks only 2% which is very less so we assume it does not shrink and many 3D printers we use PLA

First approach is use of PLA instead of ABS that means selection of material

Second approach is

to measure the effective shrinkage and resize our model to be slightly larger. So when the larger model was printed, it would hopefully shrink to the desired size.