FDM PRINTING

Fused Deposition Modeling — Layer-by-Layer Thermoplastic Extrusion

Platform: https://3d.dglabs.cloud

What is FDM printing?

FDM (Fused Deposition Modeling) is the world's most widespread additive manufacturing technology. It works by melting a thermoplastic filament and precisely depositing it layer by layer on a build plate, constructing the three-dimensional object from the bottom up. Its versatility, low cost and wide range of materials make it the ideal choice for most prototyping and on-demand manufacturing projects.

How does it work?

  1. 01

    Filament feeding

    A spool of thermoplastic filament is fed into the extruder, which drives it in a controlled manner towards the heated hotend.

  2. 02

    Melting and extrusion

    The material is melted at temperatures between 190 °C and 300 °C depending on the polymer, and precisely deposited through a 0.4 mm or smaller nozzle.

  3. 03

    Layer deposition

    The print head moves along the X and Y axes while the bed descends on Z, tracing each cross-section of the digital model.

  4. 04

    Solidification and bonding

    The molten plastic cools in a fraction of a second and bonds mechanically and chemically to the previous layer, creating the structural union of the object.

  5. 05

    Post-processing

    Once printing is complete, supports are removed, and the part can be sanded, painted, acetone-smoothed or otherwise finished as required.

Available FDM materials

Each material has unique properties. Choosing the right one determines the strength, flexibility, finish and final cost of your part.

PLA

Polylactic Acid

The most popular material in FDM printing. Biologically derived (corn or sugarcane), it prints easily without requiring an enclosure and delivers excellent surface detail across a wide range of colors and finishes.

Pros

  • Low printing temperature (190–220 °C)
  • No heated chamber or enclosure required
  • Biodegradable and plant-derived
  • Wide variety of colors and special finishes
  • Excellent surface detail
  • Affordable and widely available

Cons

  • Low temperature resistance (deformation above 60 °C)
  • Brittle under strong impacts
  • Degrades with prolonged UV exposure
  • Not food-safe without a certified coating
Use casesConcept prototypes, scale models, decorative figures, educational and architectural models, indoor objects.

PLA+

Enhanced PLA

An upgraded version of PLA with additives that increase impact resistance and layer adhesion, while retaining the ease of printing and affordability of standard filament.

Pros

  • Higher impact resistance than standard PLA
  • Better inter-layer adhesion
  • Retains PLA's ease of printing
  • Similar surface finish to standard PLA
  • Available in a wide range of colors

Cons

  • Slightly more expensive than standard PLA
  • Similar thermal resistance to standard PLA (~60 °C)
  • Slightly less biodegradable due to additives
Use casesFunctional prototypes, supports, clips, light enclosures and parts that need a bit more robustness than standard PLA.

PETG

Glycol-Modified Polyethylene Terephthalate

The perfect balance between printability and mechanical properties. PETG combines PLA's ease of printing with ABS's chemical and mechanical resistance, without the warping and fume issues.

Pros

  • Good chemical resistance (oils, weak acids)
  • Improved thermal resistance (~80 °C)
  • Less prone to warping than ABS
  • Semi-flexible properties that prevent brittle fracture
  • Available in food-safe grade (with certified nozzle)

Cons

  • Tendency to string between separate parts
  • Less rigid than ABS under heavy loads
  • Hygroscopic: absorbs moisture and must be stored sealed
  • Glossy surface that can highlight imperfections
Use casesLight mechanical parts, containers, watertight prints, medical models and consumer product prototypes.

ABS

Acrylonitrile Butadiene Styrene

A widely used engineering-grade material. ABS offers high thermal and mechanical resistance, and can be post-processed with acetone vapor to achieve smooth, injection-molded-looking surfaces.

Pros

  • High temperature resistance (~100 °C)
  • Good impact resistance
  • Acetone vapor smoothing for injection-mold-like finish
  • Widely documented industrial material
  • Machinable with conventional tools

Cons

  • Requires enclosed print chamber and stable ambient temperature
  • High risk of warping (thermal contraction)
  • Releases styrene fumes: adequate ventilation required
  • Harder to print than PLA or PETG
Use casesTechnical enclosures, automotive parts, high-temperature functional prototypes, electronic components.

ASA

Acrylonitrile Styrene Acrylate

An ABS evolution designed specifically for outdoor use. ASA maintains ABS's mechanical properties while adding outstanding UV resistance, without yellowing or degrading with prolonged sun exposure.

Pros

  • High resistance to UV rays and color fading
  • Weatherproof: rain, humidity and thermal cycling
  • Mechanical properties similar to ABS
  • Less prone to warping than standard ABS
  • Long-term color stability

Cons

  • Also requires an enclosed print chamber
  • Higher cost than ABS
  • Releases fumes: ventilation required in the workspace
  • Less color variety than PLA or PETG
Use casesOutdoor signage, automotive accessories, garden elements, outdoor brackets and any part exposed to direct sunlight.

TPU

Thermoplastic Polyurethane

A flexible filament that mimics the behavior of rubber. TPU allows printing of parts that bend, compress and return to their original shape, with excellent abrasion and mechanical wear resistance.

Pros

  • High flexibility and elasticity (rubber-like behavior)
  • Excellent abrasion resistance
  • Resistant to oils and common chemicals
  • High impact resistance without fracture
  • Available in different hardnesses (Shore A 85–95)

Cons

  • Very slow printing speed required
  • Requires direct-drive extruder; difficult with Bowden setup
  • Tendency to string if parameters are not precise
  • Hard to sand or mechanically post-process
Use casesPhone cases, gaskets and seals, footwear insoles, ergonomic grips, robot wheels and flexible joints.

Nylon (PA12)

Polyamide 12

A high-performance technical material used in industry and automotive applications. Nylon combines mechanical strength, self-lubricating properties and chemical resistance, making it essential for real engineering parts.

Pros

  • Excellent wear resistance and self-lubricating properties
  • High mechanical strength and fatigue resistance
  • Broad chemical resistance (fuels, oils, solvents)
  • Suitable for gears and dynamic-load parts
  • Good temperature resistance (>100 °C)

Cons

  • Highly hygroscopic: absorbs ambient moisture very quickly
  • Requires pre-drying and strict airtight storage
  • High risk of warping and dimensional deformation
  • Elevated printing temperatures (~250–270 °C)
  • More expensive than PLA, PETG or ABS
Use casesGears, hinges, bearings, industrial prototypes, dynamic-load parts and real machinery components.

When to choose FDM vs SLA?

FDM printing is the most versatile, cost-effective and scalable option for the vast majority of projects. If your part requires extremely smooth surfaces, sub-millimeter detail or specialized applications like jewelry or dental, SLA printing is the right alternative.

Discover SLA printing →

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