FDM vs Resin 3D Printing: Which Should You Choose?
FDM and resin (SLA) printing produce very different results. Compare strength, detail, cost and use cases to pick the right process for your project.
Not all 3D printing is the same. The two most common processes — FDM and resin (SLA/MSLA) — work in fundamentally different ways and produce parts with very different strengths. Picking the right one for your project saves money and avoids disappointment. Here is how they compare.
How Each Process Works
FDM (Fused Deposition Modelling) melts a plastic filament and lays it down layer by layer. It is the workhorse of 3D printing: affordable, available in many materials, and great for functional parts.
Resin (SLA/MSLA) cures liquid photopolymer with UV light, building up incredibly fine layers. It excels at detail and smooth surfaces, but the cured material is more brittle and the process is messier.
FDM vs SLA vs MSLA: What the Names Mean
The naming trips people up, so here is the short version. FDM (sometimes called FFF) is filament printing — one process, one name. On the resin side, SLA uses a laser to cure each layer, while MSLA uses an LCD screen to flash whole layers at once — nearly every consumer resin printer today is MSLA. For choosing a process, the distinction rarely matters: SLA and MSLA produce near-identical parts, so "FDM vs MSLA" is the same decision as "FDM vs resin". Everything in this guide applies to both.
Side-by-Side Comparison
| Factor | FDM | Resin |
|---|---|---|
| Detail / surface finish | Good — visible layer lines | Excellent — very fine detail |
| Strength / durability | Tough, impact-resistant | More brittle |
| Material choice | Wide (PLA, PETG, ABS, PC, TPU…) | Mostly specialty resins |
| Part size | Large parts practical | Best for small parts |
| Cost | Lower for most jobs | Higher per part |
| Post-processing | Minimal | Washing + UV curing required |
Are Resin Prints Stronger Than FDM?
No — for almost every practical purpose, FDM parts are stronger and far more durable than standard resin prints. Standard photopolymer resin cures into a hard but brittle material: it feels rigid in the hand, but a drop onto a hard floor or a sharp knock will chip or shatter it. An FDM part in PETG or ASA flexes, absorbs the impact and survives.
Resin does have "tough" and "ABS-like" formulations that close part of the gap, but they cost more, still fall short of engineering filaments like polycarbonate or PA-CF, and degrade faster with UV exposure. Resin parts also continue to cure in sunlight, growing more brittle over time — a real problem in the Singapore sun. If a part has any mechanical job to do, print it FDM; reach for resin when fine detail on a small display piece is the priority. We cover what determines FDM strength in detail in How Strong Are 3D-Printed Parts?
When to Choose FDM
FDM is the right call for the majority of projects:
- Functional parts — brackets, enclosures, jigs and replacement parts that need to take real loads
- Larger models — FDM handles big prints far more economically
- Prototypes and iterations — fast, cheap, and strong enough to test fit and form
- Outdoor or heat exposure — materials like PETG, ASA and PC are available
When Resin Wins
Resin shines where fine detail and a smooth finish are the priority:
- Miniatures and tabletop figures — crisp faces, textures and tiny features
- Jewellery and dental/medical models — high precision on small geometry
- Display pieces — where surface smoothness matters more than toughness
A Practical Rule of Thumb
If your part needs to do something — bear load, survive a drop, mount to a wall, live outdoors — FDM is almost always the better choice. If your part needs to look highly detailed at a small scale, resin is worth the extra cost and post-processing.
What Does Each Process Cost?
FDM is cheaper on every axis for typical parts. Filament costs a fraction of photopolymer resin per printed gram, failed prints waste less material, and there are no consumables like gloves, filters and isopropyl alcohol for washing. Resin printing also adds labour you do not see on the quote: every part must be drained, washed, cured and have its supports finished by hand.
For a palm-sized model, an FDM print might cost a few dollars in material where the same part in resin costs several times that once washing and curing are factored in. The gap widens quickly with size — large resin prints are expensive enough that most services will not offer them at all. Our guide to 3D printing costs in Singapore breaks down exactly how FDM pricing works, and the instant quote gives you a real number for your own model in seconds.
What We Offer
ZeroCore specialises in FDM printing, which covers the overwhelming majority of practical and functional jobs in a wide range of materials and colours. If you are unsure which process your project needs, send us the model and tell us how it will be used — we will recommend the right approach, and give you an instant quote for FDM.
Ready to start? Upload your STL or 3MF and get an instant quote in seconds.
We run FDM in-house on the Bambu H2 series — see the printers we use, or get an instant quote for your part.
