Design for 3D Printing
Maximize quality and minimize cost by optimizing your CAD models for FDM manufacturing. Follow these core principles to ensure your parts come out perfect every time.
Wall Thickness
Avoid paper-thin walls. 3D prints are built in layers; walls need enough perimeters to be structural.
Overhangs & Supports
The 45-degree rule: Angles greater than 45° usually require support structures, which can affect surface finish.
Holes & Tolerances
Designing for fit: Don't design parts with exact same dimensions if they need to assemble.
Orientation & Strength
Parts are weakest along the Z-axis (layer lines). Orient your part so loads don't pull layers apart.
Understanding Anisotropy
Unlike injection molded parts, 3D prints are anisotropic, meaning their strength varies depending on the direction of the load. The bond between layers is always weaker than the plastic itself.
Horizontal Printing
Best for tensile strength along the length of the part.
Vertical Printing
Avoid for tall, thin parts that will experience side loads.
Visualizing layer-line stress distribution
Infill vs. Shells
Strength comes from shells (walls), not infill. Increasing wall count is more effective than increasing infill percentage for most mechanical parts.
- 15-20% Infill: Standard for most parts.
- 40-60% Infill: Heavy duty functional parts.
- 4+ Shells: Recommended for threaded inserts or high-stress areas.
Manifold Geometry
Ensure your model is 'watertight' with no missing faces or open edges.
Scale & Units
Export your STL in Millimeters (mm) to avoid scaling issues.
Wall Thickness
Check that no part of your model is thinner than 0.8mm.
Assembly Gaps
Add at least 0.2mm of clearance between moving or interlocking parts.
Flat Base
Ensure your model has a flat surface to sit on the print bed.
File Size
Keep files under 128MB for the fastest processing.
Ready to print?
Now that your model is optimized, get an instant quote and start production.