3D Print Tolerance Calculator
Calculate clearances and tolerances for mechanical fits between 3D printed parts
About this calculator
The 3D Print Tolerance Calculator helps you determine the proper clearances and tolerances needed for mechanical fits between 3D printed parts. This tool accounts for the inherent limitations of 3D printing technology, including layer adhesion, material shrinkage, and printer accuracy. By calculating appropriate tolerances, you can ensure your interlocking parts, joints, and assemblies fit together properly without excessive looseness or binding, saving time and material on failed prints.
How to use
Input your desired fit type (sliding, press, or clearance fit) and the nominal dimensions of your parts. The calculator will recommend appropriate tolerance values based on your 3D printer type and material. Apply these calculated tolerances to your CAD design by adjusting hole sizes, shaft diameters, or gap dimensions accordingly.
Frequently asked questions
What tolerance should I use for sliding fits?
Sliding fits typically require 0.1-0.2mm clearance for FDM printers, allowing smooth movement while maintaining reasonable precision for functional assemblies.
Do tolerances vary between printer types?
Yes, SLA/resin printers achieve tighter tolerances (0.05-0.1mm) compared to FDM printers (0.1-0.3mm) due to higher resolution and accuracy.
How does material affect tolerance calculations?
Different materials have varying shrinkage rates and flexibility. ABS shrinks more than PLA, while flexible filaments require larger clearances for proper fitting.