MIT FabAcademy Week5 Note - 3D Scanning and Printing

3D Printing

3D printing isn't new. Chuck Hull invented 3D printing back to 1980s.

constraints

materials: ABS(丙烯腈—丁二烯—苯乙烯,ABS塑料), HIPS, acrylic, PLA(easier to print)

resolution: pay attention to minimal wall and edge thickness and sharpness. clearance, tolerance

time: should spend hours

cost: depend on the machine and materials. 3D Printing Materials documented materials for 3D printing.

supports

processes

• stereolithography(立体平版印刷)

  SLA，Direct Metal Printing (DMP)

• selective laser sintering(SLS)

• fused-deposition molding(FDM 熔融沉积成型), extrusion(挤出/喷出), contour crafting

• ink-jet binder(喷墨粘结剂)

• ProJet, PolyJet. Full color printing, very high resolution.

• cut sheets

• CLIP, TED talk about this

• two photon(光子)

machine

Every year MAKE magazine make a 3D printer list.

file formats

• STL （binary, triangle）Dump but simple. It doesn't include units info, you have to tell the printer the unit of your file.
• OBJ, 3ds by 3D MAX
• VRML, X3D

stay away form DXF ...

software

   123D
   SketchUp
   Fusion 360
   SolidWorks
   Rhino Grasshopper
   Blender
   FreeCAD
   OpenSCAD
   Antimony
   VTK
   MeshLab netfabb meshmixer
   Geomagic
   ReplicatorG Skeinforge Slic3r Cura

3D Scanning

point cloud, triangulation, watertight, texture

A Simple Guide To Understanding 3D Scanning Technologies

The most commonly used technologies fall into three categories:

• Displacement: Displacement devices use a single point laser beam
  projection to measure the height, thickness, or position of
  an object.
• Profile: Line Profile devices typically use a projected laser line
  to create a cross section profile for measuring aspects
  of an object’s contour. Moving an object under the laser
  line creates many profiles that can be combined into a
  complete 3D shape.
• Snapshot (aka, Scanner): Snapshot devices use structured light (non-laser) and
  stereo-vision to generate full 3D volume data. Because
  Snapshot technology captures so much 3D data at one
  time, objects need to remain stationary during the
  scanning process.

more materials

• Stratasys's course Introduction to 3D Printing: From Design to Fabrication.
• Additively is the 3D printing platform for professionals
• A guide to 3D scanner technology

All FabAcademy Notes (to be continue):

• FabAcademy Week1 Note - Introduction
• FabAcademy Week1 Assignment - Build a website and use Git
• FabAcademy Week2 Note - CAD
• FabAcademy Week2 Assignment - 3D Modeling
• FabAcademy Week3 Note - Computer-Controlled Cutting
• FabAcademy Week3 Assignment - Computer-Controlled Cutting
• FabAcademy Week4 Note - Electronics Production
• FabAcademy Week5 Assignment - 3D Scanning and Printing

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