Advantages of FDM include low cost, easy operation, and wide material availability.
Disadvantages include lower surface finish and lower accuracy compared to resin printing.
It may also produce weaker parts with visible layer lines.

Advantages and Disadvantages of FDM (Fused Deposition Modeling)

FDM (Fused Deposition Modeling) is a widely used additive manufacturing process where a thermoplastic filament is melted and deposited layer by layer to create a 3D object.

Advantages of FDM (in Detail)

1. Low Cost (Most Important Advantage)

FDM printers are cheap compared to other 3D printers
Filament materials (PLA, ABS) are also inexpensive

👉 Ideal for students, hobbyists, and prototyping

2. Easy to Use

Simple machine setup
Easy maintenance
Beginner-friendly software (Cura, PrusaSlicer)

👉 No complex chemicals or lasers involved

3. Wide Range of Materials

PLA
ABS
PETG
Nylon
TPU
Composite filaments

👉 Many material choices for different applications

4. Good for Prototyping

Quick design-to-product process
Easy to test and modify designs

👉 Used heavily in product development

5. Minimal Material Waste

Only required material is used
No cutting or machining waste

6. Safe and Clean Process

No toxic lasers or chemicals
Safe for educational environments

7. Ability to Create Complex Shapes

Can print:
- hollow parts
- internal channels
- complex geometries

Disadvantages of FDM

1. Low Surface Finish Quality

Visible layer lines
Rough surface compared to SLA

👉 Needs sanding or polishing for smooth finish

2. Weak Interlayer Bonding

Layers may not fuse perfectly
Strength is weaker in vertical direction (Z-axis)

👉 Can fail under heavy mechanical stress

3. Lower Accuracy

Not suitable for very fine details
Small dimensional errors may occur

4. Limited Heat Resistance

Most plastics deform at moderate temperatures
Not suitable for high-temperature applications

5. Slow for Large and Detailed Prints

Layer-by-layer deposition takes time
Complex models increase printing time

6. Fumes and Odor (for some materials)

ABS produces fumes during printing
Requires ventilation

7. Limited to Thermoplastics

Cannot directly print metals or ceramics
Not suitable for high-performance industrial parts

8. Post-Processing Required

Supports must be removed
Sanding, finishing often needed

Summary Table

Feature	Advantage / Disadvantage
Cost	👍 Low cost
Ease of use	👍 Simple operation
Material variety	👍 Wide options
Strength	👎 Moderate/anisotropic
Surface finish	👎 Rough
Accuracy	👎 Moderate
Speed	⚖️ Medium
Safety	👍 Safe

Summary:

👉 FDM is best described as:
“Low-cost, easy, and flexible—but not highly precise or high-strength.”

Conclusion:

FDM advantages include low cost, ease of use, wide material availability, and suitability for rapid prototyping. Its disadvantages include poor surface finish, weak interlayer bonding, limited accuracy, and low strength compared to other additive manufacturing methods.