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Our Manufacturing Standards

Updated July 21, 2021

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CMM inspection and measurement of part QACMM inspection and measurement of part QA

Our Manufacturing Standards

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 the 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.

Workmanship Standards

Orders with Xometry will meet the minimum workmanship standards outlined below (as applicable to the process). If your project requires a level of workmanship that goes beyond the standards listed below, please clearly list the requirement in your engineering drawings, purchase orders, and/or specifications. 


Finished Surfaces Cosmetics

  • Paint coverage on surfaces will be uniform, including adjacent materials of assemblies
  • Finished surfaces will be free of defects including chips, scrapes, or other damage

Mill Steps, Tooling, and Chatter

  • Tool marks on as-milled surfaces will be free of defects including burrs, chatter, tool gauges and will meet surface roughness specifications.
  • Clearly indicated critical surfaces will be free of mill steps and marks across the entire surface. 
  • Milled surfaces will meet surface roughness specifications. 

Chips, Burrs, and Sharp Edges

  • All exposed edges will be free of burrs, sharp edges, and metal slivers.

Foreign Object Debris (FOD) 

  • Surfaces will be free of cutting fluid, metal chips, foreign objects, and other debris.

Threads

  • Threads will be fully formed and cut to specified size and class according to provided drawings.
  • Threads will be free of defects, notable damage, and contamination. 

Plated Surfaces

  • Plated surfaces will be uniform, including adjacent surfaces of assemblies. 
  • Plated surfaces will be free of machining marks, scratches, pits, protrusions, or any visible bare metal. 
  • Some minor defects may be permissible in certain situations if they do not compromise the protective finish.

Weld Joints

  • Weld joints will be finished as specified in the weld callouts of the provided part drawing. 
  • Welds without specific requirements will be cleaned to remove slag or other surface contamination. 
  • If required, weld joints will not be painted until the welding has been completed and the weld has passed inspection. 

Countersinks

  • Countersinks shall be round and made to print specifications and allow the proper designed fit with the mating screw. 
  • Countersinks will be free of burrs, chatter, or other tooling defects. 

Painted Surfaces

  • Painted surfaces shall be consistent and continuous in the finish.  
  • Painted surfaces shall be free of visible machining marks, scratches, abrasions, dust particles, fisheyes, orange peel, or bare metal. 
  • Painted surfaces should be reviewed against this standard at a distance of 18" at 1X magnification. 

CNC Machining and Turning


  • 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” (metals) or +/- 0.010 (plastics and composites) in accordance with ISO 2768 unless otherwise specified.
  • For features of orientation (parallelism and perpendicularity) and form (cylindrical, flatness, circularity, and straightness) apply tolerances as follows (see the table below):
CNC milling and CNC machining services
CNC orientation and form general tolerances
Part LengthOrientation and Form ToleranceAngularity Tolerance

0 to 12"

+/- 0.005"

Angularity +/- ½ degree

12" to 24"

+/- 0.010"

Angularity +/- ½ degree

24" - 36"

+/- 1/64" (0.016")

Angularity +/- 1 degree

36" - 60"

+/- 1/32" (0.031")

Angularity +/- 1 degree

Over 60"

+/- 1/16" (0.063")

Angularity +/- 1 degree

Unless we have agreed to other tolerances in your Quote, we will work to achieve and hold the tolerances noted.

Learn More About CNC Machining

High Precision CNC Machined Part

CNC Machining Service

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CNC Machining Service

Plastic Injection Molding


  • Typical mold machined tolerances are +/- 0.005" when machining the mold and an additional +/- 0.002" per in. when calculating for shrink rate.
  • Tighter tolerances can be requested and may increase the cost of tooling. Additionally, many tight tolerances require the mold to be manufactured, sampled, and then groomed. Xometry will mill to a steel-safe condition on critical features.
  • Part-to-part repeatability is typically under +/- 0.004".
  • Lead time stated is for first article shipment. Remaining production time is confirmed after first article approval.
  • Typical first article shipments are 10 pieces but may vary based on size, origin, and material.
  • 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.
  • Gating, ejection, knit lines and parting lines are at the discretion of Xometry unless explicitly discussed.
Injection Molding

Learn More About Injection Molding

injection molded sample parts

Injection Molding Service

Get custom plastic molded prototypes and production parts in as few as 10 business days. We provide expert engineering reviews and $500 off your first mold.

Injection Molding Service

Sheet Metal Fabrication

  • 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, -0.000"
  • 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.
  • Certain sheet metal designs require custom tooling and will be flagged for a manual quote: hems, curled flanges and rolled sheets, stamped parts, and welded assemblies. If your part includes these features, please allow our manual quote team to review and provide you with an accurate cost and lead time.
Sheet Metal

Sheet Metal Tolerances Continued

Flat sheet metal part dimensions
Flat Parts
Flat sheet metal part dimensions

Sheet metal parts that utilize stock material gauge thicknesses and require no bending or milled features. All flat sheet metal parts can meet a +/-0.005” tolerance.

Simple Bend / One Surface
Simple bend sheet metal part dimensions

When designing parts with some type of bend with a standard bend radius, sheet metal tolerances are required to open. For simple bent parts, Xometry can offer a +/- 0.010” tolerance for dimensions across a single bend. The bend radius itself is constrained to a +/- 1.0°.

Multiple Surface Bends
Multi bend sheet metal part tolerances

For dimensions measured over multiple bends, Xometry can offer a +/- 0.030.

Sheet Metal Tolerances Reference Table
Dimension DetailToleranceImage Reference

Edge to Edge, Single Surface

+/- 0.005"

A

Edge to Hole, Single Surface

+/- 0.005"

B

Hole to Hole, Single Surface

+/- 0.005"

C

Hole Diameter, Single Surface

+/- 0.005"

D

Bend to Edge / Hole, Single Surface

+/- 0.010"

E

Edge to Feature, Multiple Surface

+/- 0.030”

F

Over Formed Part, Multiple Surface

+/- 0.030”

G

Bend Angle

+/- 1 deg

H


Learn More about Sheet Metal

Flat sheet metal part with holes

Sheet Metal Fabrication Services

Upload your CAD files to get an instant quote on sheet metal prototypes and production parts. Lead times as fast as 1 day and free standard shipping on all US orders.

Sheet Metal Fabrication Services

Urethane Casting

  • Tolearance are +/- 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.
  • Sharp corners and text may appear slightly rounded.
Urethane casting services

Learn More About Urethane Casting

Urethane production parts for ISOLAB TECHNOLOGIES LLC patented equipment for nuclear medicine

Urethane Casting Services

Low Volume, Durable Parts with Production-Level Quality

Urethane Casting Services

Metal Binder Jetting 3D Printing

  • Metal binder jet parts are made in ExOne 420i metal, which is roughly 60% 420 stainless steel and 40% bronze infiltration.
  • Depending on the part’s size and geometry, parts may shrink 0.8% - 2.5% after processing.
  • Internal geometries, such as slots and holes, may shrink as much as 5%.
  • Xometry does not guarantee tolerances on the first attempt at a new design.
  • 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.
  • Metal binder jet machines print in layers of 0.004” (0.1 mm) and parts are typically oriented in the lowest Z direction.
  • Parts with features below 0.03” (0.75 mm) will need to be thickened for successful processing. It is recommended the minimum feature size be above 0.04" (1 mm).
  • Modeled threads or precision features may have limited functionality as printed.
  • Tumble polished parts may have trapped walnut media between thin gaps or text features.
Metal binder jetting from ExOne

Learn More about Metal Binder Jetting

Xometry Capability

Metal Binder Jetting 3D Printing Service

Upload your CAD files to get an instant quote on parts. Parts ship in 10 days. Free shipping on all US orders.

Metal Binder Jetting 3D Printing Service

Carbon DLS™ 3D Printing

  • +/- 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.
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • 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.
Carbon DLS digital light synthesis 3D printing services

Learn More about Carbon DLS™

Carbon Digital Light Synthesis™ (DLS™) makes production parts without tooling

Carbon Digital Light Synthesis™ (DLS™) 3D Printing Service

High-Performing Prototypes and Serialized Production Parts
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Carbon Digital Light Synthesis™ (DLS™) 3D Printing Service

DMLS 3D Printing

  • +/- 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 steel 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.
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • Expected surface roughness is 150-400 µin RA, depending on build orientation and material used for the build.
Direct metal laser sintering DMLS 3D printing services

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Direct Metal Laser Sintered (DMLS) Part

Direct Metal Laser Sintering (DMLS) 3D Printing Service

Upload your CAD files to get an instant quote on metal prototypes and production parts. Parts ship in 3-5 days. Free shipping on all US orders.

Direct Metal Laser Sintering (DMLS) 3D Printing Service

FDM 3D Printing

  • +/- a single build layer thickness for the first inch and +/- .002” for every inch thereafter.
  • 0.010” layer thickness is used for parts fitting within a 14” X 16” footprint (Fortus 450)
  • 0.013” layer thickness is used for parts exceeding 14” X 16” footprint (Fortus 900)
  • 0.008" layer thickness used for Prototyping PLA (9.8" x 8.2" x 8.2", Prusa MK3S desktop FFF)
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
  • 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).
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • Horizontal holes and protrusions will build slightly oblong due to stair stepping from layers.
  • Nylon 12, ULTEM 9085, and ULTEM 1010 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.
Fused deposition modeling FDM 3D printing services

Learn More About FDM

FDM 3D printed ABS-M30 blue jigs for BMW

Fused Deposition Modeling (FDM) 3D Printing Service

High Quality Large Format FDM 3D Printing
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Fused Deposition Modeling (FDM) 3D Printing Service

HP MJF 3D Printing

  • +/- 0.012” up to 4" is typical, plus +/- 0.003” for every inch thereafter.
  • Parts with thicker geometries, flat or broad parts (>7”), and parts with uneven wall thicknesses will be prone to significant deviations or warp due to variable thermal shrinkage and stress.
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • 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.
HP Multi Jet Fusion MJF 3D printing services

Learn More About HP MJF

HP MJF 3D printed parts

HP Multi Jet Fusion (MJF) 3D Printing Service

Guaranteed Quality Prototypes and Production Parts
Free Shipping on All US Orders

HP Multi Jet Fusion (MJF) 3D Printing Service

Polyjet 3D Printing

  • +/- 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.
PolyJet 3D printing services

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PolyJet Part

PolyJet 3D Printing Service

Prototypes and Simulated Overmold Parts in as Fast as 1 Day
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PolyJet 3D Printing Service

SLA 3D Printing

  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • Tolerances for Standard and High Resolution options are described in the table below
Stereolithography SLA 3D printing services
Tolerances for SLA, Standard and High Resolution
FeatureStandard ResolutionHigh Resolution

Tolerance, XY Plane

+/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

+/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

Tolerance, Z Plane

+/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.

+/- 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.

Under 0.020” are at risk and under 0.010” will not build.

Minimum radial feature size

0.035"

0.030"

Layer height

0.004"

0.002"

Learn More About SLA

Stereolithography SLA materials have a variety of engineered properties for function and cosmetics

Stereolithography (SLA) 3D Printing Service

High-Resolution Prototypes in Days
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Stereolithography (SLA) 3D Printing Service

SLS 3D Printing

  • XY Planes: +/- 0.005” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Z Direction: +/- 0.010” for the first inch is typical, plus +/- 0.002” for every inch thereafter.
  • Parts with thicker geometries, flat or broad parts (>7”), and parts with uneven wall thicknesses will be prone to significant deviations or warp due to variable thermal shrinkage and stress.
  • Modeled threads or precision features may have limited functionality as printed. Tapping or the addition of threaded inserts is recommended for best function.
  • Guaranteed tolerances may be possible with a manual quote review, and must be approved on a case-by-case basis.
Selective laser sintering SLS 3D printing services

Learn More About SLS

Xometry Capability

Selective Laser Sintering (SLS) 3D Printing Service

Upload your CAD file to get instant quotes on SLS nylon parts. Parts ship in as fast as 1 day. Free shipping on all US orders.

Selective Laser Sintering (SLS) 3D Printing Service

General Manufacturing: Mating and Flexible Features

  • Xometry is not responsible for the fit of mating parts.
  • Xometry is not responsible for the function of snap tabs, clips, or living hinges.
Xometry's X Logo
Change Log
October 7, 2020

Added change log. Improved page formatting. Updated injection molding tolerances to reflect initial tooling tolerances.

November 19, 2020

Added plastic tolerances to CNC machining.

May 7, 2021

Updated notes for 3D printed threads, clarified tolerances on FDM, HP MJF, and SLS.

June 14, 2021

Related FDM tolerances to layer height based on platform used. Adjusted HP MJF and SLS notes on parts with uneven wall thicknesses or large geometries.

June 28, 2021

Added metal binder jetting manufacturing standards.

July 15, 2021

Incorporated language around PLA under FDM 3D Printing

July 21, 2021

Added layer height to SLA guidelines. Incorporated workmanship standards.

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