Unless you are making very teeny tiny parts, then yes, I'd ignore it. That number should be smaller than the tolerance of the printer, thus irrelevant.
0.001 on how long?
Shrinkage is measure on length ie: 0.001" on 1".
Also when you print 1", it could be longer or smaller.
Which printer is that?
If the part need to slide inside another part, you can make it 0.005 undersize overall.
If another part need to slide inside, make the 'bore' 0.005 oversize.
If they can fit tight, doesn't matter its plastic.
Maha Nadarasa wrote:
I want to model a part for 3D printing for High School project. Shrinkage value of the printing material is 0.001 ~ 0.002 inch (if I can remember correctly). I was asked to ignore the shrinkage value when dimensioning the sketch. Is it advisable?
In general, the model is made at 1:1 scale and then later shrinkage is added by using scaling feature. Since it varies on many things, the mold maker or the person doing the 3d print should be able to take care of it unless advised to do so.
I used to do 3D printed molds. It depends on the size. Sometimes trial and error.