Manufacturing Standards

Xometry, Inc.

Last Updated: 08/07/19

Unless we have agreed to other tolerances in your Quote, we will work to achieve and hold the tolerances noted below, which will vary per the primary manufacturing method you select. Xometry has developed a comprehensive set of Design Guides to assist you in optimizing your design for manufacturing method ultimately selected, please consult them for key tips and tricks. In the event of a conflict between the Design Guides and this set of Xometry Manufacturing Standards, these will control.

CNC/Machining

  • Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.
  • For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”.
  • For features of orientation (parallelism and perpendicularity) and form (cylindrical, flatness, circularity, and straightness) apply tolerances as follows:

0-12”

Tolerance of 0.005”

Angularity

+/- ½ degree

Over 12”-24”

Tolerance of 0.010”

Angularity

+/- ½ degree

Over 24"-36"

Tolerance of 0.015625" (1/64)

Angularity

+/- 1 degree

Over 36"-60"

Tolerance of 0.03125" (1/32)

Angularity

+/- 1 degree

Over 60"

Tolerance of 0.0625" (1/16)

Angularity

+/- 1 degree

Plastic Injection Molding

  • Lead time stated is for first article shipment. Remaining production time is confirmed after first article approval.
  • Typical first article shipments are 10 pieces.
  • Xometry cannot guarantee a perfect color match per Pantone color.
  • All quotes are based upon the assumption that designs have an adequate draft, radii, and coring for manufacturability.
  • Cores, side actions, and tooling strategy are determined by Xometry unless explicitly discussed.
  • Unless noted, tolerances are +/- 0.010" between the manufactured part and 3D CAD. Part-to-part repeatability is typically under 0.004".
  • Gating, ejection, knit lines and parting lines are at the discretion of Xometry unless explicitly discussed.

Metal Additive Manufacturing

DMLS – Direct Metal Laser Sintering
  • +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter. However, Xometry does not guarantee tolerances on the first attempt of a new design. Tolerance expectations can vary across different materials (e.g. stainless versus aluminum).
  • Internal stresses during build, support strategy, and other geometry considerations may cause deviation in tolerances and flatness.
  • Items and geometries which require strict flatness are not a good fit for this process.
  • Expected surface roughness is 150-400 µin RA, depending on build orientation and material used for the build. 

Non-Metal Additive Manufacturing

SLA - Stereolithography

Tolerances for standard resolution:

  • X/Y planes: +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Z plane: +/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Minimum linear feature size: under 0.030” are at risk and under 0.020” will not build.
  • Minimum radial feature size: 0.035"
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.

Tolerances for high resolution:

  • X/Y planes: +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Z plane: +/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Minimum linear feature size: under 0.020” are at risk and under 0.010” will not build.
  • Minimum radial feature size: 0.030"
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
SLS - Selective Laser Sintering
  • +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.  
  • Parts with thicker geometries, flat or broad parts, and parts with uneven wall thicknesses will be prone to significant deviations or warp due to variable thermal shrinkage and stress.  
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
HP MJF – HP Multi Jet Fusion
  • +/- 0.012” for the first inch is typical, plus +/- 0.003” for every inch thereafter.  
  • Parts with thicker geometries, flat or broad parts, and parts with uneven wall thicknesses will be prone to significant deviations or warp due to variable thermal shrinkage and stress.
  • Natural grey color may be inconsistent depending on feature size and build orientation. Dyed black is recommended for production parts.
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
FDM – Fused Deposition Modeling
  • XY Planes:  +/- 0.004” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Z Plane:  +/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Xometry chooses optimal build orientation taking into consideration overall surface quality and minimum build time unless otherwise specified.
  • Minimum resolvable feature size, including positive text features, is at least 0.035” (0.045” or greater is safest).
  • Nylon 12 parts with thicker geometries, flat or broad parts, and parts with uneven wall thicknesses will be prone to significant deviations or warp due to variable thermal shrinkage and stress.  
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
Carbon DLS – Digital Light Synthesis™ 
  • +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter. However, Xometry does not guarantee tolerances on the first attempt of a new design. Tolerance expectations can vary across different materials (e.g. elastomeric versus rigid materials).
  • Stresses during build, support strategy, and other geometry considerations may cause deviation in tolerances and flatness.
  • Parts with thicker geometries, flat or broad parts, and parts with uneven wall thicknesses may be prone to significant deviations or warp.
  • Improved tolerances may be possible with a manual quote review, after successful completion of a prototype build, and must be approved on a case-by-case basis.
PolyJet
  • +/- 0.004” for the first inch is typical, plus +/- 0.002” for every inch thereafter.  
  • Minimum feature size of 0.050” can be built with consistency.
  • Rubber-like materials represent an approximation of shore A values and may vary between geometries.

Sheet Metal

  • Forming and bending: +/- 0.020"
  • Bend to hole or feature: +/- 0.010"
  • Linear dimensions excluding locations to bends: +/- 0.005"
  • Diameters with inserts: +0.003/-0
  • Angularity: +/- 2 degrees
  • Surface roughness (blank material): Ra 125 uin max
  • Surface roughness (timesave): Ra 100 uin max
  • Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.

Urethane Casting

  • +/- 0.010” or +/- 0.003” per inch, whichever is larger, is typical. Irregular or overly-thick geometries may cause deviances or deflection due to shrinkage.
  • A shrinkage rate of +0.15% can be expected due to thermal expansion of the liquid, and the response of the flexible mold.
  • Surface finish is externally smoothed to a satin or matte surface. Grow lines may be present on internal or difficult-to-access features. Polishing or custom finishes must be clearly defined and agreed upon at the point of order.
  • We can offer urethane cast parts as large as 30” long.

Mating Parts

  • Xometry is not responsible for the fit of mating parts.