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.
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 |
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 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.
