Hong Kong Open Source Conference 2014 3D Printing Workshop A brief talk about TinyBoy, a 3D printing used in High School Education

1. TinyBoy Dissection
!
!
by: Wan Leung Wong
FOSSASIA 2014
3D Printing
Workshop

2. Everything is started from
RepRap
From the Beginning
2

3. RepRap
short for “Replicating Rapid-prototyper“
http://reprap.org

4. RepRap was founded in 2005 by
Dr. Adrian Bowyer
Senior Lecturer in mechanical engineering at the University of Bath (UK)

5. ▪ 3D printer (Print REAL plastics parts)
▪ Can self-replicate parts (For repairing or build a new
one)
▪ Open source hardware (GNU general public license)
!
What is RepRap?

6. ▪ Everyone can replicate RepRap their own
▪ Cheaply distribute RepRap units to people and
communities
▪ Everyone can create complex products without
industrial support
RepRap’s Goal

7. RepRap
X/Y/Z
moving
platform
Filament
extruder
+
Hot nozzle
Control
boards
+
Motor
driver
Heat bed
RepRap’s hardware structure

8. RepRap’s hardware structure
X - axis
Y - axis
Z - axis
Control board
+
Motor Driver
Extruder
+
Hot Nozzle
Heat bed

9. ▪ Use for teaching, on teaching Design and
Creativity
Why Tiny Boy?
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10. 10

11. RepRap
2.5 Generation

13. ▪ It’s Too Large!!!
Why TinyBoy?
13

14. 14

15. ▪A class has 35 students
▪Only 2 hours for the design class
▪1 3D model has to use at least 1 hour to print
▪Students will be easy to lost interest on
modelling design if they can’t get their
product in a reasonable time.
Why TinyBoy?
15

16. ▪So, Parker Leung, a high school teacher, started
this project in 2012.
Why TinyBoy?
16

17. TINYBOY

18. TINYBOY SPEC
• Size： 15 cm x 15cm x 22cm
!
• printing size： 8.5cm x 8.5cm x 8.5cm
!
• 1.75mm filament / 0.4mm hotend
!
• same as RepRap
!
• will be Open Source after fine tuning.

21. ▪Quality of the product is not important on
learning
▪The most Important is everyone could have one
▪Then people can learn by themselves.
Why TinyBoy?
21

23. ▪ Smaller
23

24. FIT INTO THE GAP

25. Cheaper and Faster
in Production
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27. STUDENTS COULD BUILD IT BY THEMSELVES

29. STUDENTS’ WORKS

32. Design your
own 3D
model
Use toolchain
convert 3D
model into G
code
Send G
code to
control
board
Control X/
Y/Z
Platform
and Extrude
Extrude
plastics by
layers until
print done
How 3D printing works?

33. ▪ Design your 3D model in any commercial CAD
software (Inventor, Solidworks…) or any free
3D modeling software (Blender, OpenSCAD…)
▪ Save the 3D model as STL file format.
Design your own 3D model
Blender
OpenSCAD

34. Create with David 3D scanner
配合3D立體素描來創作
David 3D Scanner
is a software can
be download freely.
!
Hardware BOM:
■ Arduino
■ Motor Drive
■ Stepper Motor
■ Web Cam
■ Line Laser
We can scan any objects and replicate by RepRap

35. “Put creams on cake” by Layers
FDM (Fused Deposition Modeling) / FFF (Fused Filament
Fabrication)
1. Thermoplastics filament are liquefied and
deposited by an extrusion head
2. Follows a tool-path defined by the CAD file
and materials deposited in layers in 0.3 mm
3. Part is built from the bottom up by layers

36. Plastic Filament Extruding

38. From 3D model to G code
1 Reading in 3D objects
2 Slicing the objects to make each build layer
3 Evaluating 2D geometry outlines
4 Generating cross-hatch infill
5 Arc compensation
6 Translate the tool path to G code

39. Toolchains to generate G code
RepRap Host Skeinforge RepSnapper

40. “RepRap Host” VS “Skeinforge”
G code generation print test result
RepRap Host Skeinforge

41. ▪“Support” printing are required if
printing parts with hollow or
invert slopes > 45°
▪Need to remove “Support”
manually after the print done
Something more about 3D Printing

42. ▪Use heat bed to keep warm
during printing to prevent
object warp by cool down
Something more about 3D Printing

43. Thanks
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