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Module 6: Post Processing and Quality

20257m

Describe the steps involved in post-processing of 3D printed parts. Include cleaning, fixing, curing, surface finishing, and colouring techniques.

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Steps in Post-Processing of 3D Printed Parts

1. Cleaning and support/powder removal

  • FDM: Remove support structures mechanically or with suitable soluble-support methods.
  • Material Jetting: Remove support material according to the material system.
  • SLS/Powder-bed processes: Remove loose powder using brushing, air or appropriate powder-removal equipment.
  • SLA: Wash the part to remove uncured resin.

2. Fixing and repair

Defects or surface gaps may be corrected using filling, gluing, welding or other material-compatible repair techniques.

3. Curing or hardening

SLA and some other resin-based parts are post-cured under controlled UV exposure to increase polymer conversion and achieve the intended properties.

4. Surface finishing

Common methods include:

  • Sanding
  • Polishing
  • Tumbling
  • Hydro dipping
  • Epoxy coating
  • Electroplating
  • Vapour smoothing, such as acetone treatment for suitable thermoplastics

5. Colouring and coating

The surface may be primed and painted or treated with dyes/coatings to obtain the required colour, appearance and protection.

Final result

The sequence is generally clean/remove supports or powder → repair/fix → cure/harden where required → surface finish → prime/paint/coat. The exact sequence depends on the printing material and intended application.

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