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Wastage of material in Rapid Prototyping is very less.
Rapid Prototyping uses materials economically.
Conventional processes involve material removal processes, in which the final shape of product is obtained by machining of excess material, which leads to wastage of material, hence increasing the cost.
Science Journal of Clinical Medicine. 
Art and science of cleft lip and cleft palate repair(Vol. 1).

In this research, a new Thermal Insulating Concrete Block (TICB) is produced via "sandwich" structure by spent polystyrene foam, cement and other raw materials.
Fig.4 Temperature change inside test rooms made by different wall materials (a) group 1 (b) group 2 Conclusions Developed TICB in this research satisfies the requirements of new wall material such as apparent density, compression strength, and thermal insulating property etc al.
Briefly, its comprehensive performance is superior to other wall materials'.
Architects' Journal (2006).
Strength and Insulating Properties of Building Blocks Made from Waste Materials.

FDM is an additive manufacturing process that uses production-grade thermoplastic materials to produce both prototypes and end-use products.
Laser Additive Manufacturing of High-Performance Materials.
New York Dordrecht London: Springer Science & Business Media
Journal of Manufacturing Science and Engineering [14] Yuan Jin, Y.
Journal of Manufacturing Systems 44, 65–78

When analyzing different device designs, a correlation is found between defect propagation velocities and thermal resistances of the materials vicinal to the quantum well, being the main heat source.
The waveguide materials of the 980, 808, and 650 nm emitting devices are Al0.085Ga0.915As, Al0.3Ga0.7As, and InGaAlP, with specific thermal resistances of about 4.5, 8 and 13 Kcm/W, respectively.
The defect propagation velocities estimated in this way are controlled by the thermal resistances of the waveguide materials, which take the main load of the heat removal from the QW.
Elsaesser, Defect evolution during catastrophic optical damage of diode lasers, Semiconductor Science and Technology, 26 (2011) 075020
Merritt, Catastrophic Damage of AlxGa1-xAs Double-Heterostructure Laser Material, Journal of Applied Physics, 50 (1979) 3721-32

Magalhães, Modeling of shrinkage defects during solidification of long and short freezing materials, Journal of materials processing technology. 202 (2008) 428-434
Beckermann, Development of a hot tear indicator for steel castings, Materials Science and Engineering: A. 413-414 (2005) 30-36
Chen, A Review on Casting Magnesium Alloys: Modification of Commercial Alloys and Development of New Alloys, Journal of Materials Science & Technology. 2016
Hort, Experimental and numerical analysis of hot tearing susceptibility for Mg-Y alloys, Journal of Materials Science. 49 (2014) 353-362
Kou, Hot cracking of binary Mg-Al alloy castings, Materials Science and Engineering A. 417 (2006) 230-238

How different alloy materials, pouring system affect the filling and solidification process of LFC and how to choose the optimum casting parameters were given by J.H.
Journal of Metals, 1983, 35
Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science.
Journal of Tsinghua university, 2001,(02):8-11
Journal of Materials Processing Technology, V 182, 2 Feb 2007, P: 333-342

This exerts a radial pressure inwards at the cut position and reduces the danger that the blade removes loose material from the sample.
Conclution Some rock samples were successfully prepared with various degrees of fracturing and different fracture fill materials.
Fig.2 Digitized record of samples Acknowledgements This work was financially supported by the China Natural Science Foundation (50478061).
Kaare hoeg: International Journal of Rock Mechanics & Mining Sciences.
Vol.35(1998) , p.17 [3] C.O.Aksoy, O.Kantarci,V.Ozacar: International Journal of Rock Mechanics & Mining Sciences .Vol.47(2010),p.272 [4] C.I.

Nowadays, people are more concern about replacing raw materials with renewable energy and hence, using waste to replace conventional materials.
The advantages of using kernel-shell as recycle materials are non-renewable materials can be replaced with renewable as well as encouraging utilization of renewable sources.
Pareige, Journal of Materials Processing Technology 182 (2007) 50-57
Ismail, Brake Pad & Disc Materials, UiTM (2007), p. 197-204
Koruda, Journal of Nuclear Materials 257 (1998) 59-66.

Chinese Journal Of Rock Mechanics And Engineer, 2010(29)2148-2158
Journal of Hebei Polytechnic University (Natural Science Edition), 2009(31)11-13
The Application Of Porous Materials in HV&AC.Refrigeration and Air Conditioning[J], 2009(23)26-30
Journal of the University of Petroleum , China, 2000(24)111-116
Building Science, 2010(26)94-107.

Journal of Building Materials. 2004, 7(4): 29-34.
Journal of Building Materials, 2004, 7(4): 447-450.
Journal of Materials in Civil Engineering, 2003, 15 (5):443-451
Journal of Materials in Civil Engineering, 2003, 15(5): 443-451
China Building Materials Science & Technology, 2007, 3: 6-10.