The most common type of additive manufacturing is material extrusion, especially Fused Filament Fabrication (FFF).
It is widely used because it is low-cost and easy to operate.
It is popular for prototyping and educational applications.

Most Common Type of Additive Manufacturing

The most common type of additive manufacturing used worldwide is:

👉 Material Extrusion — especially FFF/FDM (Fused Filament Fabrication / Fused Deposition Modeling)

Why Material Extrusion (FFF/FDM) is widely used?

👉 It is the cheapest, easiest, and most widely available 3D printing method

What is FFF/FDM?

👉 A process where a thermoplastic filament is melted and deposited layer by layer to create a 3D object.

How it works (Step-by-step)

1. CAD Model

3D design is created on computer

2. Slicing

Model is divided into thin layers

3. Heating Filament

Plastic filament (PLA, ABS, etc.) is melted in a nozzle

4. Layer Deposition

Melted material is deposited layer by layer

5. Solidification

Each layer cools and bonds with previous layer

Materials Used

PLA (most common)
ABS
PETG
Nylon
Composite filaments (carbon fiber reinforced)

Advantages

1. Low Cost

Machines are cheap (even ₹15,000–₹50,000 for basic printers)

2. Easy Operation

Simple setup and maintenance

3. Widely Available

Used in homes, schools, industries

4. Safe and User-Friendly

No lasers or harmful radiation

5. Good for Prototyping

Fast design testing

6. Large Community Support

Open-source software and hardware

Applications of FFF/FDM

Education

Engineering models
Learning prototypes

Home Use

Toys
Household tools

Industry

Jigs and fixtures
Rapid prototypes

Automotive

Design testing parts

Limitations

Lower strength compared to metals
Layer lines visible (poor finish)
Not suitable for high-performance parts
Limited material options (mainly plastics)

Comparison with Other AM Types

Type	Usage Level	Reason
Material Extrusion (FFF/FDM)	⭐⭐⭐⭐⭐ Most common	Cheap, simple
Powder Bed Fusion	Medium	High cost
SLA (resin printing)	Medium	High accuracy but expensive
DED	Industrial	Complex systems
Binder Jetting	Industrial	Post-processing needed

Summary:

👉 Although many advanced AM technologies exist,
FFF/FDM dominates because it is affordable, simple, and accessible to everyone.

Conclusion:

The most common type of additive manufacturing is material extrusion (Fused Filament Fabrication/FDM), where thermoplastic filament is melted and deposited layer by layer. It is widely used due to its low cost, simplicity, and availability.