Design Guide for 3D Printing
Everything you need to know to design parts optimized for additive manufacturing. Follow these guidelines to ensure the best quality prints.
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Choosing the Right Technology
FDM (Fused Deposition Modeling)
Best for functional prototypes, durable parts, and larger prints. Ideal for mechanical components and testing.
- Layer height: 0.1mm - 0.3mm
- Min wall thickness: 0.8mm - 1.2mm
- Tolerance: ±0.5mm
SLA (Stereolithography)
Perfect for high-detail models, smooth surfaces, and intricate designs. Great for jewelry, dental, and precision parts.
- Layer height: 0.025mm - 0.1mm
- Min wall thickness: 0.4mm - 0.6mm
- Tolerance: ±0.1mm
File Requirements
Most common, widely supported
Supports color and texture
CAD format, fully editable
Watertight Mesh
Ensure your model has no holes or gaps in the mesh. All edges must be connected.
Correct Units
Export in millimeters (mm). Verify dimensions before sending.
Single Object
Merge multiple parts if they should be printed as one piece.
Critical Design Principles
1. Wall Thickness
Recommended
- FDM: Minimum 0.8mm - 1.2mm
- SLA: Minimum 0.4mm - 0.6mm
- Optimal: 2mm+ for strength
- Uniform thickness throughout
Avoid
- Walls thinner than minimum spec
- Sudden thickness changes
- Paper-thin features
- Unsupported large flat areas
2. Support Structures & Overhangs
45-Degree Rule
Overhangs greater than 45 degrees from vertical require support structures. Design self-supporting geometries when possible to reduce post-processing and material waste.
- 0-45°: No supports needed
- 45-70°: Supports recommended
- 70-90°: Supports required
- Horizontal bridges: Max 5mm unsupported span
3. Fine Details & Features
Minimum Feature Size
FDM: 0.8mm | SLA: 0.3mm
Fine text, intricate patterns, small holes
Engraved Text
Min 0.5mm depth, 2mm height
Use sans-serif fonts, avoid serifs
Embossed Text
Min 0.5mm height, 2mm size
Better than engraved for visibility
Holes & Threads
Min 2mm diameter
Consider drilling for precision holes
4. Clearances & Tolerances
For moving parts or assemblies, add clearance between mating surfaces:
Tight fit / Press fit
Sliding fit / Assembly
Loose fit / Easy assembly
Common Design Mistakes to Avoid
Thin Walls
Problem: Walls thinner than minimum specification
Solution: Use minimum 0.8mm for FDM, 0.4mm for SLA
Extreme Overhangs
Problem: Angles greater than 45° without support
Solution: Add chamfers or design self-supporting geometry
Sharp Internal Corners
Problem: Stress concentrations and print difficulties
Solution: Add fillets (0.5mm minimum radius)
No Tolerance Gaps
Problem: Parts fused together in assemblies
Solution: Add 0.3-0.5mm clearance between parts
Tiny Features
Problem: Details smaller than nozzle diameter
Solution: Keep features above 0.8mm for FDM
Large Solid Sections
Problem: Warping, long print times, material waste
Solution: Add internal hollowing or honeycomb infill
Best Practices & Pro Tips
Orient for Strength
Position parts so layer lines run perpendicular to expected stress for maximum strength.
Design for Printability
Minimize supports by orienting parts with flat bases and avoiding extreme overhangs.
Add Draft Angles
Include 2-5° draft angles on vertical walls to improve surface finish and ease support removal.
Use Chamfers over Fillets
Chamfers are easier to print than fillets on bottom edges, reducing support material.
Test Before Scaling
Print a small test version first to verify fit, function, and design before full-scale production.
Simplify Geometry
Remove unnecessary details that won't be visible or functional to reduce print time and cost.
Material-Specific Guidelines
PLA (FDM)
Easy to print, minimal warping, good for prototypes and non-functional parts.
- • Low heat resistance (~60°C)
- • Biodegradable, eco-friendly
- • Excellent surface finish
- • Not suitable for outdoor use
ABS (FDM)
Strong, durable, good heat resistance, suitable for functional parts.
- • Higher heat resistance (~100°C)
- • Can be acetone smoothed
- • Prone to warping on large prints
- • Use enclosed printer for best results
Standard Resin (SLA)
High detail, smooth finish, perfect for display models and intricate designs.
- • Excellent surface quality
- • Brittle, not for functional parts
- • UV sensitive, may yellow over time
- • Requires post-curing
Need a quick-reference comparison of all materials?
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