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We need more information to answer that as it could be several things at play. What do the parts look like? What tolerance have you designed in? What printer settings are you using? Which plastic? Should it be a tight or a loose fit? What's the size of the parts?

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As Robert says we need that information to help you specifically. Bear in mind that shrinkage is a complex subject with many variables affecting it. If we talk about shrinkage in percentage terms, then different materials will shrink differently. I am sure that the same material, e.g. PLA, from different manufacturers will shrink differently. I have a strong suspicion that even the same material from the same manufacturer, in a different colour, can shrink differently. Temperature affects it so you can, if not managed properly, get a different shrinkage when using a heated bed and not using a heated bed; the difference in temp. between the inside of the printing enclosure and the ambient temperature will be different. How quickly you remove your piece from the warm printer into your cold winter room will affect it. Geometry affects it. Your printer hardware will affect it. Ultimately testing and experience will help you get more accurate for your environment.

One thing is for sure and that is that generally the slower you print the more accurate you will be.

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