BharatNotes What is Additive Manufacturing?
Additive Manufacturing (AM) — commonly called 3D printing — is the process of joining materials to make parts from digital 3D model data, usually layer upon layer. The international standard ISO/ASTM 52900 contrasts it with subtractive manufacturing (machining away material) and formative manufacturing (moulds, dies, casting). The standard groups all AM technologies into seven process categories: binder jetting, directed energy deposition, material extrusion, material jetting, powder bed fusion, sheet lamination and vat photopolymerisation. Materials range from polymers and ceramics to metals (titanium, Inconel) and even biological tissue (bioprinting).
Key Features and Advantages
- Design freedom: complex geometries, lattice structures and consolidated single-piece parts impossible with conventional methods.
- Material efficiency: material is added, not cut away, sharply reducing wastage (high "buy-to-fly" efficiency in aerospace).
- Mass customisation: patient-specific implants, dental aligners and prosthetics.
- Decentralised, rapid prototyping: digital files can be printed on demand, shortening supply chains.
India's Policy Push and Milestones
The Ministry of Electronics and IT (MeitY) released the National Strategy on Additive Manufacturing on 24 February 2022, anchored in Make in India and Atmanirbhar Bharat. Its targets: 50 India-specific technologies, 100 new start-ups, 500 AM products, 10 manufacturing sectors and 1 lakh new skilled workers, aiming to raise India's share of the global AM market to about 5% and add roughly US$1 billion to GDP. The National Centre for Additive Manufacturing (NCAM), a MeitY–Government of Telangana initiative in Hyderabad (Section 8 company; new facility inaugurated June 2023), is the apex body for the AM ecosystem.
| Milestone | Detail | Date |
|---|---|---|
| National Strategy on Additive Manufacturing | Released by MeitY | 24 Feb 2022 |
| ISRO 3D-printed PS4 engine | 665-second hot test; Laser Powder Bed Fusion cut 14 parts to 1, eliminated 19 weld joints; made with Wipro 3D | 9 May 2024 |
| Agnikul Cosmos Agnibaan SOrTeD | World's first flight of a single-piece 3D-printed (semi-cryogenic) engine; India's first launch from a private launch pad (Dhanush, Sriharikota) | 30 May 2024 |
Significance for India
AM directly serves defence indigenisation (spares for legacy platforms), the space economy (engines printed in days instead of weeks — Agnikul prints an engine in roughly 72–75 hours), healthcare (implants, surgical models) and MSME competitiveness. ISRO's redesign of the PS4 engine reduced raw-material use from 565 kg to 13.7 kg of metal powder and cut production time by about 60% (ISRO, May 2024), illustrating AM's resource economics.
UPSC Angle
Treat AM as a foundational Industry 4.0 concept. Prelims may test the layer-by-layer definition, the difference from subtractive manufacturing, or pair current-affairs items like Agnibaan SOrTeD and the 3D-printed PS4 engine with statements on the National Strategy (2022). For Mains GS3, link AM to manufacturing competitiveness, Atmanirbhar Bharat in defence/space, the start-up ecosystem and concerns such as skill gaps, costly imported machines and powders, intellectual-property risks and standardisation.
