TinyBoy Dissection !!

by: Wan Leung Wong

FOSSASIA 2014

3D Printing Workshop

Everything is started from RepRap

From the Beginning

2

RepRap

short for “Replicating Rapid-prototyper“

http://reprap.org

RepRap was founded in 2005 by

Dr. Adrian Bowyer Senior Lecturer in mechanical engineering at the University of Bath (UK)

▪ 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?

▪ 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

RepRap

X/Y/Z moving

platform

Filament extruder

+ Hot nozzle

Control boards

+ Motor driver

Heat bed

RepRap’s hardware structure

RepRap’s hardware structure

X - axis

Y - axis

Z - axis

Control board +

Motor Driver

Extruder +

Hot Nozzle

Heat bed

▪ Use for teaching, on teaching Design and Creativity

Why Tiny Boy?

9

10

RepRap

2.5 Generation

▪ It’s Too Large!!!

Why TinyBoy?

13

14

▪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

▪So, Parker Leung, a high school teacher, started this project in 2012.

Why TinyBoy?

16

TINYBOY

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.

▪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

▪ Smaller

23

FIT INTO THE GAP

Cheaper and Faster in Production

25

STUDENTS COULD BUILD IT BY THEMSELVES

STUDENTS’ WORKS

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?

▪ 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

Create with David 3D scanner 配合3D立體素描來創作

David 3D Scanneris 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

“Put creams on cake” by Layers

FDM (Fused Deposition Modeling) / FFF (Fused Filament Fabrication)

1. Thermoplastics filament are liquefied anddeposited by an extrusion head

2. Follows a tool-path defined by the CAD fileand materials deposited in layers in 0.3 mm

3. Part is built from the bottom up by layers

Plastic Filament Extruding

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

Toolchains to generate G code

RepRap Host Skeinforge RepSnapper

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

RepRap Host Skeinforge

▪“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

▪Use heat bed to keep warm

during printing to prevent

object warp by cool down

Something more about 3D Printing

Thanks

43