Manufacturing Standards

Xometry, Inc.

Last Updated: 11/8/18

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+/- 1/2 degree
    Over 12"-24"Tolerance of 0.010"Angularity+/- 1/2 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

Xometry currently offers Direct Metal Laser Sintering (DMLS) to 3D print metals using additive manufacturing techniques.

DMLS

  • Tolerances of +/-.005" plus .002" per inch is typical for DMLS. 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 uin RA, depending on build orientation and material used for build.

Non-Metal Additive Manufacturing

Xometry currently offers SLA (Stereolithography), SLS (Selective Laser Sintering), FDM (Fused Deposition Modeling) and PolyJet across a range of machine and material combinations.

SLA

Tolerances for standard resolution:

  • X/Y planes: +/- .005” for the first inch, plus +/- .002” for every inch thereafter
  • Z plane: +/- .010” for the first inch, plus +/- .002” for every inch thereafter
  • Minimum linear feature size: under .030” are at risk and under .020” will not build
  • Minimum radial feature size: .035"

Tolerances for high resolution:

  • X/Y planes: +/- .005” for the first inch, plus +/- .002” for every inch thereafter
  • Z plane: +/- .010” for the first inch, plus +/- .002” for every inch thereafter
  • Minimum linear feature size: under .020” are at risk and under .010” will not build
  • Minimum radial feature size: .030"

SLS

  • +/- 0.005″ or +/- 0.002″ per inch, whichever is greater. Build area up to 13 x 13 x 20″ (13″ max dimension preferred)
  • 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.
  • Theoretical maximum build volume of 13” x 13” x 20″ (13″ max dimension preferred).

FDM

  • +/- 0.004″ or +/- 0.002″ per inch in the XY-direction, whichever is greater.
  • +/- 0.010" or +/- 0.002" per inch in the Z-direction, whichever is greater.
  • Xometry chooses part orientation to maximize part quality unless otherwise specified.
  • Minimum resolvable feature size, including positive text features, is at least 0.035” (0.045” or greater is safest).
  • Theoretical maximum build volume of 24” x 36” x 36.”
  • 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.

PolyJet

  • +/- 0.004″, or +/- 0.001″ per inch, whichever is greater. Build area up to 19 x 15 x 7″
  • Theoretical maximum build volume of 19” x 15” x 7.”
  • 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 external 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 casted parts as large as 30” long.

Mating Parts

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