The document outlines a 3D printing workshop led by Dr. Raymond Pang at the Caritas Institute of Higher Education, providing an overview of 3D printing technologies, applications, and hands-on experience with a 3D printer. It covers various methods of 3D printing, including stereolithography, selective laser sintering, and fused deposition modeling, as well as software and materials used in printing. Additional resources for 3D modeling are also mentioned, along with step-by-step instructions for preparing and printing 3D objects.

1. 3D Printing
Workshop 2016
Dr. Raymond Pang
(wmpang@cihe.edu.hk)
明 愛 專 上 學 院
計 算 機 及 信 息 科 學 學 院
School of Computing and Information Science
Caritas Institute of Higher Education
21 May 2016

2. What is 3D Printing?
 Third industrial revolution
 Change traditional way of
manufacture
 Subtractive Manufacturing
 Remove unnecessary parts from
material
 E.g. sculpture
 Injection Molding
 Inject melt material into mold
 Additive Manufacturing
 Object as stackable layers

3. 3D Printing: The History
 In 1984, Charles Hull developed first
3D printing device -- Stereo
lithography
 Stereolithography (SLA)
(立體平板印刷)
 is defined as “system
for generating 3D objects
by creating a cross-
sectional pattern of the
object to be formed”

4. 3D Printing: The Technologies
 Later in 1980s, similar technologies emerge including
 Selective Laser Sintering (SLS)
 Laminate Object Manufacturing (LOM)
 Fused Deposition Modeling (FDM)

5. 3D Printing: The Technologies
 SLS (選擇性雷射燒結)
 high power laser to fuse
small particles of plastic,
metal, ceramic, or glass
powders
 LOM (層狀物體製造)
 adhesive-coated paper, plastic,
or metal laminates glued
together and cut to shape with a
knife or laser cutter
http://goddard.cotsaweb.com/kjmjg/
http://www.techbang.com/posts/18161-3d-printer-technology-talk

6. 3D Printing: The Technologies
 FDM (熔融沉積成型)
 laying down material in layers
 plastic filament or metal wire
is unwound from a coil and
supplies material to extrusion
nozzle
 Either the nozzle or/and
platform have to move
synchronously to construct
the object layers

7. 3D Printing: Applications
 Prototyping
 Household goods or
accessories
 Medical
 Fashion

8. 3D Printers
 2 Major 3D technology companies in US
 3D Systems
 Stratsys

9. What will we do today?
 Learn how to use a 3d printer
 Learn and experience creating 3d
print objects
 Use 3d systems cube for
demonstration
http://www.3dsystems.com/shop/support
/cube/videos

10. Parts in the 3D Printer

11. From virtual to real
 First, we need to have a 3D model
(a digital version of the object) for
printing
 3d model represents only the
surface of object
 Surface usually
is constructed by polygons
 Triangle is the simplest ones

12. From virtual to real
 As per additive manufacturing,
objects are printed in layers
 A conversion is needed to be
performed before sending to
printer
 A companion software with the
printer is thus necessary

13. Cube Print the Software
 Cube Print
 companian software of the 3D Systems’ Cube
printer

14. Structural Supports
 Like construct a building
 Structural supports are need to
avoid collapse
 Some are internal
 Make the object stronger
 Some are external
 Have to be removed

15. Structural Supports

16. Structural Supports

17. Structural Support in CubePrint

18. Materials
 ABS (Acrylonitrile Butadiene Styrene)
 commonly used thermoplastic
 lightweight
 requires less force to extrude than PLA
 print at about 230°C
 PLA (Polylatic Acid)
 harder than ABS
 melts at a lower temperature (around 180°C to 220°C)

19. The Print File
 Choose “SAVE TO FILE” will output a .cube file
 Save it to your USB thumbdrive
 Plug it into the printer
 The USB port on left side

20. The Print File
 Press “PRINT” from the touch
screen of printer
 Select the file for printing
 Press left or right to browse other
files on the drive
 Apply glue on the plate

21. Wait, wait and wait
 Take a coffee break

22. After Printing…
 Clean with water to remove glue
 Gently lift the object to remove it
from the platform

23. 3D models for printing

24. Ways to create 3D objects
 Scanning from real objects
 Create using of modeling software
 123D design
 SketchUp
 Download from Internet
 Thingiverse (http://www.thingiverse.com)
 SketchUp 3D Warehouse
(https://3dwarehouse.sketchup.com)
 GrabCAD (http://grabcad.com)

25. Sketchup Make
 Free version of SketchUp
 https://www.sketchup.com/zh-TW/products/sketchup-make
 Originally for architectural design

26. Sketchup Make
 3D Print specific template
 Shows the print area for
reference
 Units are in mm

27. Make it specific to our printer
 Window > Component Options
 Choose “3D Systems Cube”

28. Moving in the Environment
 Change your view points with
 Orbit
 Mouse move with :
 Mouse middle button
 Pan
 Mouse move with :
 Shift + Mouse middle button
 Zoom
 Scroll with mouse wheel

29. Views in the Environments
 Camera>Standard Views

30. Drawing and Select 2D Shapes
 Lines
 Straight line or Freehand
 Arcs
 Shapes
 Select Tool
 Single click (Interior)
 Double click
(Both outline and interior)
Single click Double click

31. Draw in Freehand
 We can draw things in free hand
 Our own style and less regular

32. Merging Shapes
 Place shapes together
 Select internal lines
 Delete them
Select & Delete

33. Transformations (2D and 3D)
 Move
 Rotate
 First define the rotation axis
 Move mouse to rotate about the axis
 Scale

34. Offset
 Useful to create wall or hollow
shapes
Offset inward
Remove to
create wall

35. Modeling with Extrude
 Push/Pull
For example, Draw a circle and then push
We got a PIE!!

36. Modeling with Extrude
 You can still draw on the pie
 Use copy to duplicate what you drawn

37. Modeling with Extrude
 Another extrude
 Make the convex eyes
 Draw a half circle using “arc”
 Followed with another extrude to
make a concave shape

38. Save the model
 Choose File>Save
 Save only to SketchUp’s own format (.skp)
 For printing, we need more portable
formats like STL or OBJ etc.

39. Sketchup Plugins
 To export to STL, we need install
additional plugins
 Window>Extension Warehouse
 SketchUp STL
 Click Install

40. SketchUp STL
 Select the 3D object
 File>Export STL…

41. Open in Cube Print

42. Let’s Print Now!
 Dimension: 4x4x1cm
 36 mins

43. Shape by Path Following
(Follow Me)
 Draw two shapes
 One is the circle
(For the shape)
 One is hexagon
(As the path)
 Choose the hexagon
 Click Tools>Follow Me
 Select the circle

44. Shape by Path Following
(Follow Me)
 We can create more shapes with
this method
offset

45. Bitmap to Mesh
 Again, SketchUp Plugin
 Search “Bitmap to Mesh”
and Install
 Convert height field to
mesh
 Can also refer to following video
on what it can do
 https://www.youtube.com/wat
ch?v=oGU7NABqEeU

46. Bitmap to Mesh: Bitmap Edit
 Edit the bitmap with common image
editing tools
 InfraView
 GIMP
 Photoshop

47. Bitmap to Mesh
 After editing the bitmap:
 Choose Draw>Mesh from Heightmap
 Then select your bmp file
 Recommend to have smaller
bmp file (around 200x200)

48. Bitmap to Mesh (2)
 Then you need to draw
where to create the
mesh
 Click and Drag (the red
rectangle)
 Enter depth of your
height map

49. Bitmap to Mesh
 Wait for the generation of mesh…
 Finally …

50. 3D Scanning
 Digitize real objects
 Hand-held scanner

51. Generate the model
 After scanning, we obtain a 3D
model of the real object with
texture

52. Time of Creativity !!

53. References
 “3D Printing For Dummies” by Kalani
Kirk Hausman
 “3D Printing with SketchUp” by Marcus
Ritland
 “Cube 3 User Guide” by 3D Systems
 “Sense 3D Scanner User Guide” by 3D
Systems

54. Thanks for joining
the workshop