FDM (Fused Deposition Modeling) is the most widely used 3D printing method. It is used by hobbyists and manufacturing companies, and increasingly by smaller businesses that need a physical part quickly and without tooling. This article explains how the technology works, what it is suited to and where its limits are.
How FDM works
The printer heats plastic filament and deposits it layer by layer according to a digital model. It needs no moulds or tools, only a 3D model, for example in STL or STEP format.
Many materials can be used. PLA, PETG and ABS are common, and for more demanding use there are ASA (UV-resistant), polycarbonate or flexible TPU. The choice depends on whether it is a visual model, a functional prototype or a final part.
Where FDM helps businesses
Prototypes. You can try out a physical part before investing in production. If something does not fit, you adjust the model and print a new version.
Spare parts. For plastic covers, clips, inserts or stops, printing is often a faster route than waiting for a supplier. It is not a solution for every part, especially not for highly stressed components.
Production fixtures. Drilling templates, positioning fixtures or protective covers are traditionally machined. Printing makes them easier to produce, and for most applications their quality is sufficient.
Presentation models. A physical model of a product often says more than a visualisation. The customer can hold it in their hands.
Small series and custom pieces. For low quantities, it makes no sense to invest in injection moulds. Printing is then more economical.
Limits of FDM
- Surface: layers are visible on the print. If appearance matters, allow for finishing, such as sanding or painting.
- Strength: a part is stronger along the layers than across them, which needs to be considered in the design.
- Fine details and complex shapes: SLA or SLS is often a better choice here.
FDM compared with other methods
| FDM | SLA | SLS | |
|---|---|---|---|
| Cost | Lower | Medium | Higher |
| Detail | Medium | High | High |
| Material | Plastics (wide choice) | Resins | Nylon (PA) |
| Best for | Prototypes, functional parts | Fine details, smooth surface | Complex shapes, strong parts |
What you need to get started
To use 3D printing, you do not need to buy a printer or employ a specialist. You only need to know what you want to make. If you do not have a 3D model, we can prepare one. At MATERIA we work with FDM, SLA and SLS, so we will suggest the technology according to the specific part.
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