Grade 8 Greenbook Chapter 4

Have you written your name, your class and your class number?
For example: Huang Jo - 8M5 - 41

• Yes

• No

What does FDM stand for?

What does SLA stand for?

What is this 3D Printing Technology? (a)  

• Fused Deposition Modelling (FDM)
• Stereolithography Apparatus (SLA)

What is this 3D Printing Technology?​
It is ​ (a)  

• Stereolithography Apparatus (SLA)
• Fused Deposition Modelling (FDM)

How does Fused Deposition Modelling (FDM) work?

• The 3D printer read the g-code. The printing nozzle heats and melts the filament. The filament is forced through the nozzle to build the 3D object layer by layer.

• A 3D model file in STL of OBJ format is imported into a slicer program.

• The program will then “slice” the digital 3D object into separate layers and generate a g-code file which indicates the movement and setting of the printer.

How does Stereolithography Apparatus (SLA) work?

• A 3D model file is imported into a slicer program.

• A build platform lowers into the tank. The UV laser traces one layer of the design each time. The liquid resin hardens into solid and creates a single layer of the object.

• The build platform rises and the above process is repeated.

• The tank is filled with liquid photopolymer resin.

How does Fused Deposition Modelling (FDM) work?
Step 1: A 3D model file in ​ (a)   is imported into ​ (b)   ..

Step 2: The program will then ​ (c)   the digital 3D object into ​ (d)   and generate a g-code file which indicates the movement and setting of the printer.

Step 3: The 3D printer read the g-code. The printing nozzle heats and melts the filament. The filament is forced through the nozzle to build the 3D object layer by layer.

• STL or OBJ format
• a slicer program
• “slice”
• separate layers

How does Stereolithography Apparatus (SLA) work?

Step 1: ​ (a)   is imported into a slicer program.

Step 2: The tank is filled with​ (b)   .

Step 3: A build platform lowers into the tank. The ​ (c)   traces one layer of the design each time. The liquid resin hardens into ​ (d)   and creates a single layer of the object.

Step 4: The build platform rises and the above process​ (e)   .

• A 3D model file
• liquid photopolymer resin
• solid
• is repeated
• UV laser

FDM and SLA: Pros and Cons

Groups:

(a) FDM Pros

,

(b) FDM Cons

,

(c) SLA Pros

,

(d) SLA Cons

• Limited in the complexity of details

• Affordable for home use

• Expensive

• Able to produce complicated designs