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Overview of Additive Manufacturing Techniques

Apr 28, 2025

Lecture Notes: Additive Manufacturing Process

Introduction

  • Presenter: Alex, Lab Technician at Digital Manufacturing Lab
  • Topic: Pipeline of Additive Manufacturing Process
  • Context: Part of the Chess Piece Design Project

Digital Design Representation

Methods to Obtain a Digital Model

  1. CAD Software
    • Common choice among students
  2. 3D Scanning Technology
    • Available in the lab
    • Uses infrared technology
    • Best for matte surfaces with convex geometry
    • Limitations: Not suitable for shiny surfaces or detailed internal structures

STL File Format

  • Definition: Standard Triangle Language
  • Characteristics:
    • Collection of small triangles forming the geometry surface
    • No color, material, or additional information
  • File Formats:
    • Text format: Human-readable
    • Binary format: More compact, saves storage
  • Key Considerations Before Printing:
    1. Model Integrity:
      • Ensure STL file is error-free, shell is closed and watertight
      • Use software like Netfabb or Meshmixer for integrity checks
      • Volume calculation issues indicate potential errors
    2. Unit Consistency:
      • Check boundary box size (length, width, height)
      • Ensure it fits within the 3D printer capacity

3D Printing Technology

FDM: Fused Deposition Modeling

  • Process:
    • Uses melted plastic extruded from a heated printhead
    • Layer-by-layer building from bottom to top
  • Slicing Software:
    • Converts STL to machine-readable instructions (e.g., G-code)
    • Software used: GrabCAD Print
    • Functions:
      • Model optimization and orientation
      • Support structure generation
  • Support Material:
    • Required for overhangs or internal details
    • Removable after printing
    • Strategies to minimize use of support structures

Post-Processing

  • Process:
    • Removal of support structures
    • Conducted in a hot bath with water and support removal agents
    • Ensures clean and smooth surface finish
  • Technology:
    • Advanced technology using water-soluble support material

Additional Information

  • Facility: Digital Manufacturing Lab
    • Part of UB Science and Engineering Shared Facilities
    • Offers 3D printing, 3D scanning, and other services
    • Some services free for students, but 3D printing incurs a cost for materials

Conclusion

  • Visit the lab's website for more information and resources on 3D printing
  • Thanks for attending the lecture

Full transcript