Note:

• Wall thickness refers to the overall thickness of the part.
• Minimum feature size refers to the smallest local detail that can be produced.

2.1 FDM Technology 3D Printing Wall Thickness

Fusion Deposition Modeling (FDM) works by extruding thermoplastic filament through a nozzle and building parts layer by layer. Common filament diameters are 1.75 mm and 2.85 mm. We recommend using 1.75 mm filament, which is the industry standard. Typical nozzle diameters include 0.2 mm, 0.4 mm, 0.6 mm, and 1.0 mm.

As a general rule, wall thickness should be at least 2× the nozzle diameter:

• 0.2 mm nozzle → minimum wall thickness: 0.4 mm
• 0.4 mm nozzle → minimum wall thickness: 0.8 mm

For functional parts, we recommend a wall thickness of at least 1.0–1.2 mm to ensure sufficient strength.

2.2  SLA 3D Printing Wall Thickness

SLA (Stereolithography) uses a laser to cure liquid resin into solid parts, allowing for high precision and fine details. Industrial SLA systems typically allow a minimum wall thickness of around 1.0 mm, and features as small as 0.5 mm can be printed.

However, in real production, parts must go through post-processing steps such as:

• Resin cleaning (alcohol washing)
• Support removal
• Sandblasting

Thin walls are especially vulnerable during these processes. Even if a 1.0 mm wall can be printed, it may be damaged during handling.

In practice: Printable does not always mean manufacturable.

2.3  SLS 3D Printing Wall Thickness

SLS (Selective Laser Sintering) uses a laser to fuse powder materials at high temperatures. One advantage is that it does not require support structures. However, the printing chamber typically operates at temperatures above 200°C. During cooling, internal stresses can cause deformation—especially in large thin-wall areas.For this reason, warping is a key concern in SLS.

• Recommended wall thickness: ≥ 1.5 mm
• Minimum feature size: 0.8 mm

While thinner features may be possible, they carry a higher risk of deformation.

2.4 MJF 3D Printing Wall Thickness

MJF (Multi Jet Fusion) builds parts by applying binding agents and heat to fuse powder materials layer by layer. It is similar to SLS but generally offers better stability and more uniform mechanical properties.

• Recommended wall thickness: ≥ 1.2 mm
• Minimum feature size: 0.6 mm

Even though MJF allows thinner walls than SLS, maintaining sufficient thickness is still important for structural integrity.

2.5 SLM / DMLS Metal 3D Printing Wall Thickness

SLM (Selective Laser Melting), also known as DMLS (Direct Metal Laser Sintering), uses a laser to fully melt metal powder layer by layer.Unlike SLS, DMLS 3D Printing requires support structures to prevent deformation caused by thermal stress.

Thin walls are particularly sensitive because:

• Internal stresses are high
• Support removal requires machining or grinding
• Post-processing can deform delicate structures

Recommended guidelines:

• Wall thickness: ≥ 1.2 mm
• Minimum feature size: 0.5 mm
• For airtight or high-strength parts: ≥ 1.5 mm

2.6 Additional Technologies

Other 3D printing technologies include Binder Jetting, DLP, LCD, and Sand 3D Printing. For more detailed guidance, feel free to contact IN3DTEC. Our engineering team can help you optimize your design and avoid common manufacturing issues.

If you're not sure whether your design meets the wall thickness requirements for 3D printing, we can help.
Upload your CAD file to receive:

• A fast quotation
• Design for manufacturability (DFM) feedback

Let us help you get it right before production.