Quality and Accuracy Standards

Quality and Accuracy Standards // Additive

Standard Tolerances Per Process	FDM	Poly Jet	MJF	SLS	SLA	DMLS
Z Accuracy	CY Tolerances + .002″ per inch or .005″ (Whichever is greater)	+/- 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	.005 for the first inch and .002 for every additional inch	+/- 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	Standard Machined Finished Tumbled Polished Bead Blasted (sand or glass)
Aluminum	1 – 1000	+/- 0.005″	High Strength Low Weight High Machinability Low Cost	Standard Machined Finished Tumbled Polished Bead Blasted (sand or glass)
Brass	1 – 1000	+/- 0.005″	Corrosion Resistant Chemical Resistant High Density High Strength Non-Conductive	Standard Machined Finished Tumbled Polished Bead Blasted (sand or glass)

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)	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)
ABS	1 – 100	+/- 0.008″	Medium Tensile High Impact Strength Electrical Insulator High Machinability Low Cost	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)
Acrylic	1 – 100	+/- 0.008″	High Tensile Strength Can Be Polished for High Optical Clarity	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)
Nylon 6/6	1 – 100	+/- 0.008″	High Tensile Medium Impact Strength Maintains Properties Over Range of Temperatures	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)
Acetal (Delrin #)	1 – 100	+/- 0.008″	Medium Tensile Medium Impact Strength Holds Machining Tolerances Well Good Wear & Fatigue Resistance	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)
ULTEM®	1 – 100	+/- 0.008″	High Tensile Strength High Working Temperature Range (335°F) Electrical Insulator High Optical Clarity (Clear)	Standard Machined Finish Tumbled Flame or Vapor Polished (Acrylic Only)

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.