1. Rapid Prototyping

2. Rapid Prototyping 3D Printing Laser Object Modelling (LOM)
Stereolithography
Solid Ground Curing
Selective Laser Sintering (SLS)

3. 3D Printing Designed on CAD Sent to the machine Prints layer by layer
ABS plastic
From a plastic coil, it is heated and comes out of a nozzle
Needs support material
Excellent speed
Fair surface finish
Fair accuracy
Better price than other options

4. Laser Object Modelling (LOM)
Designed on CAD
Information sent to the machine
Laser cuts out current layer
Layers build up to make 3D object
Paper layers
Each layer is attached to the previous layer (heated roller applies pressure to bond the new layer)

5. Laser Object Modelling (LOM)
Very good speed
Poor quality
Poor surface finish
Poor material

6. Stereolithography Designed on CAD Information sent to the machine
Employs a vat of liquid ultraviolet curable photopolymer "resin" and an ultraviolet laser to build parts' layers one at a time.
For each layer, the laser beam traces a cross-section of the part pattern on the surface of the liquid resin.
Exposure to the ultraviolet laser light cures and solidifies the pattern traced on the resin and joins it to the layer below.

7. Stereolithography Large part size Accurate Average speed
Very good surface finish

8. Solid Ground Curing
Process of hardening of photopolymers by a complete lighting and hardening of the entire surface (the ENTIRE LAYER), using specially prepared masks.

9. Solid Ground Curing Designed on CAD Information sent to the machine
The cross section of each slice layer is calculated
The optical mask is generated conforming to each cross section.
Platform is covered with a thin layer of liquid photopolymer.
The mask corresponding to the current layer is positioned over the surface of the liquid resin, and the resin is exposed to a high-power UV lamp.
The residual liquid is removed from the work piece by an aerodynamic wiper.
A layer of melted wax is spread over the work piece to fill voids. The wax is then solidified by applying a cold plate to it.
The layer surface is trimmed to the desired thickness by a milling disk.
The wax is melted away upon completion of the part.

10. Solid Ground Curing
Good speed
Good accuracy
Good surface finish

11. Selective Laser Sintering (SLS)
Designed using CAD
Information sent to the machine
Powders of different materials (metal/ceramics/polymers) are used
Laser hits the selected area
:aser fuses powders (sintering)
Makes the particles melt and solidify
Powder bed lowered after each layer

12. Selective Laser Sintering (SLS)
Average to good speed
Good accuracy
Good surface finish
Good material

13. Materials Overview 3D Printing – solid plastic models
Laser Object Modelling (LOM) – paper only
Stereolithography – resin/polymers
Solid Ground Curing - photopolymers
Selective Laser Sintering (SLS) – metal/cermamic/polymer powders