| Standard Tolerances Per Process | FDM | Poly Jet | MJF | SLS | SLA | DMLS |
| Z Accuracy | XY Accuracy Plus Additional Tolerance of -0.0001″ Slice Height | +/- 0.2mm (.008″) or .002mm/mm (Whichever is Greater) | +/- 0.5mm or 0.5% (Whichever is Greater) | +/- 0.3mm or 0.3% (Whichever is Greater) | +/- 0.2mm (.008″) or 0.02% (Whichever is Greater) | +/- 0.005” for the first inch, plus an additional +/- 0.0035 per inch thereafter |
| Standard Layer Thickness | .25mm (0.010″) | .03mm (.001″) | .08mm (.003″) | .12mm (.005″) | .1mm (.004″) | 0.020-0.040 µ Stainless, Maraging Steel (MS1) and Inconel, or .030-.060 µ Aluminum and Titanium |
| XY Accuracy | */- .127mm (.005in) or +/- .002 mm/mm (.002 in/in) (Whichever is Greater) | +/- 0.2mm (.008″) or .002mm/mm (Whichever is Greater) | +/- 0.3 mm (0.012″) on XY or -0.3% (Whichever is Greater) Note: Values Can Increase For Solid Runs With Wall Thickness Over 5mm | +/- 0.3 mm (0.012″) or -0.3% (Whichever is Greater) Note: Values Can Increase For Solid Runs With Wall Thickness Over 5mm | +/- 0.2mm (Whichever is Greater) | +/- 0.005” for the first inch, plus an additional +/- 0.0035 per inch thereafter |
| XY Resolution | Typically 2x Layer Thickness But Highly Variable | 600 dpi | 1200 dpi | Minimum Feature Size 1 mm (.030″) | Up TO 4000DPI Note: Spot Location Onlu Minimum Feature of 0.25mm (0.010″) | — |
| Metal | Optimal Quantity | Tolerances (+/-) | Advantages & Considerations | Finish & Appearance |
| Stainless Steel | 1 – 1000 | +/- 0.005″ | High Strength High Corrosion Resistance High Weldability |
Standard Machined Finished Tumbled Polished Bead Blasted (sand or glass) |
| Low Carbon Steel | 1 – 1000 | +/- 0.005″ | Common Steel High Machinability High Weldability Can Be Hardened Not Corrosion Resistant |
|
| Aluminum | 1 – 1000 | +/- 0.005″ | High Strength Low Weight High Machinability Low Cost |
|
| Brass | 1 – 1000 | +/- 0.005″ | Corrosion Resistant Chemical Resistant High Density High Strength Non-Conductive |
| Plastic | Optimal Quantity | Tolerances (+/-) | Advantages & Considerations | Finish & Appearance |
| HDPE | 1 – 100 | +/- 0.008″ | Medium Impact Strength Flexible (Shore D70) FDA Compliant No Water Absorption |
Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only) |
| PC | 1 – 100 | +/- 0.008″ | Medium Tensile High Impact Strength Maintains Properties Over Range of Temperatures High Optical Clarity (Clear) |
|
| ABS | 1 – 100 | +/- 0.008″ | Medium Tensile High Impact Strength Electrical Insulator High Machinability Low Cost |
|
| Acrylic | 1 – 100 | +/- 0.008″ | High Tensile Strength Can Be Polished for High Optical Clarity |
|
| Nylon 6/6 | 1 – 100 | +/- 0.008″ | High Tensile Medium Impact Strength Maintains Properties Over Range of Temperatures |
|
| Acetal (Delrin #) |
1 – 100 | +/- 0.008″ | Medium Tensile Medium Impact Strength Holds Machining Tolerances Well Good Wear & Fatigue Resistance |
|
| ULTEM® | 1 – 100 | +/- 0.008″ | High Tensile Strength High Working Temperature Range (335°F) Electrical Insulator High Optical Clarity (Clear) |
All Tolerances Based on actual Capability Studies and Standard Material Variations
All Tolerances below apply PRIOR to Finish.
Single hit hole size: +/-.005”
Punched/Laser Feature to Punched /Laser Feature in same Plane: +/-.010”
Punched/Laser Feature to a Single Formed Feature: +/-.015”
Punched/Laser Feature to Punched/Laser Feature over 4 Formed Features: +/-.030”
Formed Feature to Formed Feature: +/-.020”
Formed Features over several Formed Features: +/-.020” PLUS +/-.005” for each additional Formed Feature
Basic Welded parts and components: +/-.030”
Contact Fathom for specific Tolerances related to complex Welded products.
Formed Angles Sharp to 3/32″ Inside Radius: +/- 1 degree
Formed Angles above 3/32″ to 3/16″ Inside Radius: +/- 1 1/2 degree
Formed Angels above 3/16″ to 3/4″ Inside Radius: +/- 2 degree
Formed Angles above 3/4″ Inside Radius: +/- 3 degree
For any Dimensions specified to “Apply after Finish”, Please contact Fathom for guidance on tolerances based on the chosen finish and materials.
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