Fused Deposition Modeling (FDM)
Fused Deposition Modeling (FDM) is the most widely used 3D printing technology in the world. It builds a part by melting a plastic filament and laying it down one thin layer at a time, fusing each layer to the one below. It is affordable, forgiving, and scales from a desktop printer to an industrial machine, which is why it is the default starting point for most prototypes and many end-use parts. This guide covers how it works, the materials, where it shines, where it falls short, and roughly what it costs.
How FDM works
A spool of plastic filament feeds into a heated nozzle, usually running between 190°C and 260°C depending on the material. The nozzle melts the filament and extrudes a fine bead onto the build plate, tracing out the cross-section of your part. The plate (or the nozzle) then steps down by one layer height, typically 0.1mm to 0.3mm, and the next layer is drawn on top, bonding to the last. Repeat a few hundred to a few thousand times and a solid object emerges. The same family is also called FFF (Fused Filament Fabrication), a trademark-free name for the identical process.
Because the inside of a part can be a lattice rather than solid plastic, FDM lets you trade strength against material and cost by changing infill, from a light 15% honeycomb up to 100% solid.
FDM materials
Material is where FDM gets its versatility. The common ones, and what each is for:
- PLA — cheap, easy to print, biodegradable. Best for visual prototypes, models and display pieces. Not for heat or heavy load.
- PETG — tougher and more flexible than PLA, water-resistant and food-safe. A good all-rounder for functional parts.
- ABS — heat-resistant and impact-tough (the LEGO plastic), but it warps and smells while printing. For enclosures and automotive-style parts.
- TPU — rubbery and flexible. For grips, gaskets, phone cases and anything that needs to bend.
- Nylon, polycarbonate and carbon-fiber-reinforced filaments — the engineering tier, for high strength, stiffness and temperature resistance.
We stock all the standard materials plus specialty filaments like silk, marble and wood-fill. If you are unsure which fits, see not sure which material to choose.
What FDM is good at
- Cost. It is the cheapest 3D printing process by a wide margin, which makes iterating cheap, too.
- Material range. From a $5 visual model to a carbon-fiber jig, one process covers it.
- Build size. FDM scales to large parts more easily and affordably than resin or powder processes.
- Functional prototypes and low-volume production. Tough materials plus tunable infill make real, usable parts, not just lookalikes.
Where FDM falls short
No process is universal. FDM’s trade-offs:
- Visible layer lines. The 0.1–0.3mm layers leave a ribbed surface that needs sanding, priming and paint for a smooth, product-grade finish. That is what our colour and finishing step is for.
- Limited fine detail. Features under about 0.5mm blur. For crisp small detail, SLA resin is the better tool.
- Layer-direction strength. Parts are weaker along the Z-axis, across the layer lines, so orientation matters for load-bearing parts.
- Overhangs need support. Anything steeper than ~45° needs printed support material that is later removed.
If your part lives or dies on surface finish, fine detail or isotropic strength, it is worth comparing technologies first, see which 3D printing technology is best for you and our FDM vs SLA vs SLS guide. You can also read up on the common print defects FDM can throw, and how we avoid them.
What FDM costs
FDM is priced by the gram of plastic it uses plus machine time, so a hollow, light-infill part costs far less than a solid block the same size. As a rough guide it starts from S$0.10 to S$0.30 per gram, and a typical hand-sized part runs S$15 to S$80. Volume discounts begin at 10 identical units. For the full breakdown across processes and finishing, see our 3D printing rates in Singapore, or upload a file to the instant-quote tool for an exact price in seconds.
What people use FDM for
- Prototyping — accurate, low-cost test parts to check form and fit before committing to production.
- End-use parts — durable functional parts for low-volume runs.
- Jigs and fixtures — custom tooling and manufacturing aids, made fast.
- Architectural and educational models — large, detailed shapes brought down to a presentable scale. We use FDM heavily in our scale model work.
Is FDM right for your project?
If you want a functional prototype, a custom part or a low-volume run, and you do not need a flawless surface straight off the printer, FDM is usually the fastest and most economical answer, and anything it leaves rough we can finish in-house. If you need fine detail, isotropic strength or a smooth-as-moulded surface, another process may fit better.
Not sure which way to go? Send us your file or your idea on the contact page and we will recommend the right process and quote it the same business day.
Frequently asked
What is FDM 3D printing?
FDM (Fused Deposition Modeling) is a 3D printing process that melts a plastic filament and extrudes it through a heated nozzle, depositing it layer by layer onto a build plate. It's the most common and most affordable 3D printing technology, the kind you'll typically see in school labs and home printers. Materials include PLA, PETG, ABS, TPU, and nylon.
What materials can FDM print?
Standard FDM materials are PLA (cheap, easy, biodegradable), PETG (food-safe, more flexible), ABS (heat-resistant, smells when printing), and TPU (rubbery flexible). Engineering FDM also handles nylon, polycarbonate, and carbon-fiber-reinforced filaments. We stock all the standard ones plus specialty filaments like silk, marble, and wood-fill.
What are FDM's limitations?
FDM struggles with (1) fine detail under 0.5mm, where features blur, (2) overhangs steeper than 45° need support material, (3) weak Z-axis bonds on parts that flex perpendicular to layer lines, and (4) visible layer lines that need post-processing for a smooth finish. For these, SLA or SLS is usually a better fit.
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