Application: Architecture

Chapter 1: Introduction to RP for architectural studies
Chapter 2: Introduction to Fused Deposition Modeling (FDM)
Chapter 3: Introduction to StereoLithography Apparatus (SLA)
Chapter 4: Introduction to Selective Laser Sintering (SLS)
Chapter 5: Introduction to Laminated Object Manufacturing (LOM)
Chapter 6: Introduction to 3D Printing (Concept Modeling)
Chapter 7: Alternative use of rapid prototyping
Chapter 8: RPD equipment/material manufacturers around the World

Introduction to 3D Printing (Concept Modeling)

Introduction

Unlike SLA or FDM, 3D Printing(3DP) is not an equipment but a category or technologies. The similarity among the technologies is that they all employ a array of nozzles (bubble-jet like devices, thus the term 3D Printing) to spray droplets that solidified to form the prototype parts.

Generally speaking the mechanical properties of parts by 3D Printers are much inferior compared with SLA or FDM. However, most commercially available 3D Printer produce parts much faster than other RP technologies. This make them perfectly suitable to replace foam models making. Because of that, 3D Printers are often call 'Concept Modeller'

ThermoJet

ThermoJet by 3D Systems Inc. is a typical 3D Printer that employ the inkjet deposition technology ( termed Multi-Jet Modeling - MJM by 3Dsystems).  A linear array of nozzle deposit molten wax on a platform layer by layer. Supports in the shape of small pillar are generated by program automatically, and print together with the part in one pass.

^ Enlarge	Cordless drill housing created by ThermoJet. This side is rough because it is the down-face of the built.
^ Enlarge	The smoother up-face.

Beside making concept models, ThermoJet can also be used to make quick PC casting mould.

Z402

Z402 from ZCorp is another equipment that employ similar concept. the difference is that instead of two sets nozzles, droplets of binder are sprayed through single set of nozzles on a vat of starch or plaster powder, much similar to those of SLS.

	Exterior of Z402.
	Excavating the part from the powder vat. Sweeper can be seen on the right of the vat.

There is no need to create or remove supports for Z402 parts. However, the part must be impregnated with wax or epoxy for strengthening.