Engineering Fit: Optimising Design for Functional 3D Printed Assemblies

Engineering Fit

Tolerance and fit are essential concepts that mechanical engineers use to optimise the functionality of assemblies and production costs.. For 3D printed assemblies specifically, designing for proper tolerance and fit lowers post processing time and ease of assembly, also reducing the material cost of iteration.

Use this white paper as a resource for designing functional 3D printed assemblies, or as a starting point when designing the fit between parts printed in Formlabs Tough or Formlabs Durable resins.  This whitepaper will provide more information on:

  • The value of tolerances in 3D printing

  • The categories and types of engineering fit

  • Specific recommended design tolerances for Formlabs Tough and Formlabs Durable resins

  • The coefficient of friction for Formlabs Tough and Formlabs Durable resins are also measured, which can be helpful for designing sliding or kinematic solutions.

What you will learn

Design functional 3D printed assemblies that work as intended, with the least amount of post processing or trial and error. You will learn:

  • How to choose the appropriate fit (clearance, transition, or interference) for different types of functional 3D printed assemblies

  • When to use Tough or Durable resins for different fits and assembly applications

  • Recommendations for lubricants, bonded components, and machining

This white paper also includes downloadable test 3D models that allow you to repeat our tests and determine design tolerances for other 3D printed materials.

Complete the form below to download your PDF.


More information:

Contact us for more information on 3D printing and resin options today or see our full range of 3D printers, resins, filaments and accessories at

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