FDM vs SLS: which 3D printing technology to choose
A comparison of FDM and SLS 3D printing — materials, accuracy, strength, surface and typical applications. We'll help you pick the right technology for your part.
In custom 3D printing, the two most common technologies are FDM and SLS. Both build a part layer by layer, but they differ in principle, in the properties of the parts and in price. Here is an overview to help you choose.
FDM (Fused Deposition Modeling)
FDM deposits molten plastic layer by layer. It is the most versatile and most cost-effective technology.
- Materials: PLA, PETG, ABS, ASA, nylon, TPU
- Advantages: low price, wide choice of materials, speed
- Disadvantages: visible layers, strength depends on the print direction
- Ideal for: prototypes, covers, fixtures, simpler functional parts
SLS (Selective Laser Sintering)
SLS fuses powdered nylon with a laser. The part is surrounded by powder, so it needs no supports.
- Materials: PA12 nylon, glass-filled PA12
- Advantages: high strength in all directions, complex shapes without supports
- Disadvantages: higher price for single parts, grainier surface
- Ideal for: functional parts, small batches, complex geometries
Comparison at a glance
| Parameter | FDM | SLS |
|---|---|---|
| Price | Lower | Higher |
| Strength | Good, anisotropic | High, isotropic |
| Supports | Yes | No |
| Complex shapes | Limited | Excellent |
| Series | Smaller batches | Tens to hundreds of parts |
How to decide
If you need a cheap prototype or a simpler part, choose FDM. If it's a strong functional part, a complex shape or a small batch, SLS is worth it. If you're not sure, write to us — we'll recommend a technology based on your specific part.