When using FDM for 3D printing, there is a significant risk that the holes in the printed parts may experience shrinkage. This shrinkage can lead to dimensional inaccuracies, which might prevent the printed holes from meeting the necessary assembly specifications. Such deviations can be problematic, especially in applications where precise fit and alignment are crucial. 

Recommendation 1: Replace the Material with Resin One effective way to mitigate this issue is by switching from FDM to a resin-based 3D printing process, such as SLA or DLP. Resin printing typically offers higher resolution and better dimensional accuracy, which can significantly reduce the risk of shrinkage in the printed holes. This method provides smoother surface finishes and more precise details, making it ideal for components that require tight tolerances. 

Recommendation 2: Accept the Risk Alternatively, you may choose to proceed with FDM printing while accepting the inherent risk of shrinkage. If the assembly tolerances are not critically tight, or if post-processing options (such as drilling or reaming) are available to correct the hole dimensions, accepting this risk might be a viable option. This approach could be more cost-effective and faster, depending on the project’s requirements and constraints.

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