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Prepare a metal-printing model as a manufacturing package, not just as an exported STL. Choose the powder-bed process, alloy, machine and finishing route first; then create a watertight parametric solid, orient it for stable printing, design supports and powder escape, verify walls and holes against the supplier’s rules, and send both native CAD and a validated mesh for review. There is no universal wall thickness, overhang angle, tolerance or hole diameter: laser powder-bed fusion and electron-beam powder-bed fusion impose different limits, and the same alloy can behave differently on different machines. The workflow below turns those variables into explicit design decisions before you release a file.
What should I decide before modeling for metal additive manufacturing?
Decide the process, alloy, machine and post-processing route before you freeze geometry. A design that works in laser powder-bed fusion may need different walls, support rules or relief features in electron-beam powder-bed fusion, and supplier limits can change with build direction and heat treatment.
Choose the process and alloy
Ask whether the bureau will use laser powder-bed fusion (often called SLM or DMLS by service providers) or electron-beam powder-bed fusion. Confirm the exact alloy designation, because powder characteristics, thermal behavior and finishing capability are material-specific. Obtain the supplier’s current design guide and build-envelope drawing before setting minimum dimensions.
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Define the finished part, not only the as-built part
List the functional surfaces, fits, threads, sealing faces, bearing seats, cosmetic faces and inspection datums. Decide which surfaces will remain as-built and which will be machined, blasted, tumbled, coated or otherwise finished. This determines where to leave stock and where supports may safely touch.
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Reserve the machine’s build envelope
Check the usable volume in all three axes, including the supplier’s margins for recoater clearance, support structures and cut-off. Protolabs Network describes approximately 250 × 250 × 300 mm as an average build volume for large metal-AM machines, but that is a general reference rather than a guarantee for a particular machine. Confirm the actual envelope with the bureau.
How do I create a valid solid before exporting?
Keep a native, parametric CAD master and make sure it represents one valid solid (or an intentionally documented multi-body assembly). Repair geometry before tessellation; fixing a mesh after export can conceal design errors and alter critical dimensions.
Clean the CAD model
- Remove self-intersections, zero-thickness regions, duplicate faces and coincident edges.
- Close gaps and stitch surfaces so every intended body is watertight.
- Correct inverted normals and inconsistent face orientations.
- Suppress construction bodies, hidden reference geometry and unnecessary internal detail from the manufacturing export.
- Use the CAD system’s solid-validity or geometry-check command, then inspect section views around cavities, blends and thin features.
Verify units and dimensions
Write the unit system into the release record and check a few known dimensions after export. A millimetre-versus-inch error can produce a file that is syntactically valid but unusable. Measure overall length, a hole diameter and one functional datum in the exported file, then compare them with the drawing and the supplier’s upload preview.
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Give the native master, exported mesh, drawing and material specification the same revision identifier. If the supplier repairs or reorients the file, request the revised build file and retain it with the approved drawing so the printed part can be traced to the released geometry.
Which file format should I send to a metal-printing service?
Send STEP when the supplier accepts it, and include a validated STL or 3MF for the machine workflow. A mesh-only handoff is possible at some bureaus, but keeping the parametric master lets you resolve dimensional questions without reverse-engineering triangles.
| Format | Best use | Important checks |
|---|---|---|
| STEP | Native CAD exchange and design review | Confirm the supplier’s supported STEP application protocol and that units, solids and assembly structure survive import. |
| STL | Common triangle mesh for build preparation | Use a watertight mesh, correct normals, explicit units and deliberate tessellation. STL itself does not reliably carry unit metadata. |
| 3MF | Mesh handoff where the supplier’s software supports it | Check whether the workflow preserves units, multiple bodies and intended orientation. |
| AMF | Open additive-manufacturing exchange option | ISO/ASTM identifies STL as common and AMF as a preferred open exchange format; actual bureau support still varies. |
ISO/ASTM guidance also emphasizes that a part should be devised so its build orientation is obvious or explicitly specified. Put the intended build direction in the drawing or submission notes rather than leaving the operator to infer it from an arbitrary file orientation.
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How fine should the STL or 3MF mesh be?
Use a tolerance that preserves functional curves without creating an unnecessarily large file. A coarse mesh produces visible facets and can shift measured dimensions; an extremely fine mesh increases file size, transfer time and slicing or repair time without improving the printed surface beyond the machine’s capability.
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Set chordal and angular tolerances deliberately
Rapidobject recommends binary STL with a 0.05 mm chordal deviation and 2° angular deviation for its workflow. Treat those values as that provider’s starting point, not a universal standard. Tighten the chordal deviation around small radii, sealing surfaces and inspection features, then compare the tessellated model with the CAD master using a deviation or section analysis.
Validate the exported mesh
- Export in the agreed unit system and confirm the bounding-box dimensions.
- Run a mesh repair check for holes, non-manifold edges, self-intersections, duplicate triangles and inverted normals.
- Inspect cylinders, cones and shallow angles for faceting at the intended viewing and sealing surfaces.
- Open the file in the supplier’s build-preparation software or preview and verify orientation, scale and body count.
- Freeze the validated mesh revision; do not silently replace it after the supplier has quoted or approved the build.
How should I orient a part for SLM, DMLS or other powder-bed fusion?
Choose orientation to balance stability, surface quality, supports, thermal gradients, machining access and inspection—not merely to minimize height. Decide it during design and document the build direction, because orientation changes which faces are down-facing, how heat leaves the part and where supports can be removed.
Evaluate each candidate orientation
- Stability: provide a broad, reliable connection to the build plate and avoid isolated islands that start without adequate anchoring.
- Down-facing area: reduce large downward surfaces that may require supports or show rougher finish.
- Thermal path: avoid long, thin projections and abrupt mass changes that amplify thermal gradients and distortion.
- Support access: leave a tool path for cutting, breaking or machining supports after the build.
- Functional surfaces: keep sealing, bearing and cosmetic faces away from support scars when possible, or orient them so they can be machined.
- Inspection: make datums and critical features accessible to the planned measurement method.
Compare support-heavy and self-supporting strategies
| Strategy | When it helps | Trade-offs |
|---|---|---|
| Support-heavy orientation | Preserves a preferred feature direction or keeps a critical surface in a favorable layer orientation. | Consumes powder and build time, increases removal work and can leave witness marks or residual stress. |
| Self-supporting redesign | Uses slopes, arches, ribs or teardrop profiles to reduce supports and improve access. | May change the envelope, local dimensions or internal flow path and can require a new engineering review. |
ISO/ASTM 52911-3:2023 states that “parts designed for additive manufacture should be devised such that build orientation is obvious and/or specified.” Put an arrow, plane or text note on the drawing and repeat the orientation in the purchase order or build request.
How do I design overhangs and supports?
Overhang limits are process-, alloy-, machine- and orientation-specific. Design supports as part of the part strategy, then confirm the actual angle rules with the supplier’s software and parameter set.
Use angle guidance as a screening tool
Xact Metal’s guidance reports that downward angles from 0–30° need supports, 30–45° may print without them but can have poor down-facing finish, and angles above 45° are generally self-supporting. These ranges are not guarantees: layer thickness, exposure parameters, cross-section size and heat flow can move the practical boundary.
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Place and remove supports intentionally
- Attach supports to sacrificial pads, non-sealing faces or stock that will be machined away.
- Avoid trapping support tips inside blind cavities or channels that cannot be reached with cutting tools.
- Break large flat down-facing surfaces into arches, ribs or a slight slope where function permits.
- Check for unstable islands created by holes, bosses or separated features; add a connection or change the orientation before automatic support generation.
- Ask the bureau how supports will be cut off, whether wire EDM or sawing is used, and what witness-mark allowance is expected.
What wall thickness, pin diameter and aspect ratio are safe?
There is no single minimum that applies to every metal printer. Published figures illustrate the spread: Xact Metal reports typical minimum walls of 100–200 microns and an 8:1 maximum height-to-width ratio for tall features; Rapidobject recommends 1.0 mm general walls and places 0.5–1.0 mm walls at customer risk; Protolabs Network lists 0.4 mm minimum wall thickness and pins above 1.5 mm as example rules.
| Feature | Published guidance | How to use it |
|---|---|---|
| Minimum wall | 100–200 µm typical in Xact Metal guidance | Use only as a process-specific starting point; verify alloy, orientation and unsupported length. |
| General wall | 1.0 mm recommended by Rapidobject | More conservative for a general service workflow; 0.5–1.0 mm is identified as customer risk there. |
| Example service minimum | 0.4 mm in Protolabs Network guidance | Confirm whether the rule applies to the selected alloy, feature height and orientation. |
| Small pins | Above 1.5 mm in Protolabs Network examples | Increase diameter or add support and finishing stock when the pin is tall or exposed. |
| Tall-feature aspect ratio | 8:1 maximum height-to-width in Xact Metal guidance | Shorten, thicken, brace or reorient slender posts that exceed the ratio. |
Check thin features in context
Wall thickness is only one variable. A nominally acceptable wall can fail if it is tall, isolated, connected to a massive block, exposed to recoater contact or oriented horizontally without support. Model ribs with smooth transitions, avoid abrupt thickness changes and have the supplier review any feature near its published minimum.
How large should powder-escape holes be?
Every enclosed powder-bed-fusion volume needs a deliberate route for unfused powder to leave after printing. Xact Metal recommends at least a 3.0 mm escape hole, while Protolabs Network gives 2–5 mm as an example range. The correct opening depends on cavity length, powder, access direction, cleaning method and whether the opening affects strength or sealing.
Design the escape path, not just the hole
- Place openings at low points or at both ends of long passages so powder does not settle in a pocket.
- Provide line-of-sight or a cleaning route for vacuum, air blast or other approved powder-removal equipment.
- Use multiple openings for branched or large cavities when one opening cannot drain the volume.
- Blend or chamfer the opening if it is exposed to handling, fluid flow or a mating component.
- Document whether the opening remains in service, is plugged, or will be machined after cleaning.
Make internal geometry self-supporting where possible
Large horizontal holes and flat internal ceilings can require internal supports that are difficult or impossible to remove. A teardrop, arch or other self-supporting profile can eliminate that trapped hardware when the functional envelope allows it. Confirm the revised shape with the designer responsible for flow, clearance and fatigue requirements.
How do I prepare holes, channels and enclosed cavities?
Model internal features around the realities of powder removal, support access and inspection. A cavity that is geometrically printable may still be unusable if powder cannot be cleared or a gauge cannot reach the critical surface.
Holes and bores
State whether a bore is acceptable as-built or will be drilled, reamed or bored. Orient critical bores so supports do not scar their working surface, and leave enough stock for the chosen finishing operation. For long small bores, ask the supplier about powder evacuation and whether the inspection method can measure the full depth.
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Channels and lattices
Use a cleaning access plan for every channel intersection. Lattices and nested volumes may need larger openings, multiple vents or a separate powder-removal operation. Avoid creating blind pockets solely to reduce mass unless the bureau confirms that residual powder can be removed and verified.
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Break up broad horizontal ceilings with a slope, arch or teardrop profile where the application permits. If a flat ceiling is unavoidable, include it in the support and finishing review rather than assuming automatic support generation will make the surface acceptable.
How much machining and finishing allowance should I add?
Add stock only where a defined finishing operation will remove it, and show the final dimension on the drawing. Rapidobject recommends about 1.0 mm machining allowance on surfaces intended for machining; 3D Formtech recommends 0.5 mm. These are provider-specific starting points, not interchangeable guarantees.
Plan the finishing sequence
- Identify the datum surfaces that will be established first.
- Allocate stock for facing, turning, milling, drilling or reaming based on the machine shop’s capability.
- Ensure supports and cut-off tabs do not consume the stock needed to reach the final dimension.
- Specify heat treatment or stress relief before final machining when distortion or residual stress could affect the fit.
- Call out blasting, tumbling, coating or polishing separately from dimensional machining.
Tighter fits, threads, bearing seats and seals are normally achieved through finishing rather than by relying on the as-built surface. 3D Formtech notes that functional threads are commonly machined or use inserts for small sizes. Design a thread relief, pilot hole or insert pocket where the assembly requires one, and identify the tool or insert standard on the drawing.
What tolerances and surface requirements should be on the drawing?
Separate general as-built tolerances from critical post-machined dimensions. Rapidobject lists a general tolerance of ±0.3 mm in its SLM guidance; that figure belongs to its stated workflow and should not be applied automatically to another machine, alloy or feature orientation.
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- Identify datum references and the inspection method for position, flatness, concentricity and runout.
- Specify surface-finish requirements by surface and state whether the value applies before or after finishing.
- Define edge breaks, support witness limits and acceptable cosmetic zones.
- State heat-treatment condition, hardness or other material requirements when they affect the part’s function.
What should I send for a supplier design review?
Send a complete release package so the bureau can assess manufacturability before quoting or nesting the part. A mesh alone does not communicate your intended orientation, critical tolerances or powder-cleaning plan.
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Release-package checklist
- Native parametric CAD file, preferably STEP when accepted, with revision and units.
- Validated STL or 3MF mesh with the agreed tessellation settings.
- 2D drawing showing datums, critical dimensions, tolerances, threads, fits and surface requirements.
- Alloy designation, required material condition and any certification requirement.
- Intended build orientation, build-plate contact assumptions and areas where supports are allowed or prohibited.
- Powder-escape openings, cavity-cleaning method and any plugs or post-build seals.
- Machining allowances, heat treatment, stress relief and cut-off or finishing instructions.
- Inspection plan, including which dimensions are measured as-built and which are measured after machining.
Questions to ask the bureau
- Does the model fit the selected machine’s usable build volume with the proposed orientation?
- Which faces will receive supports, and how will those supports be removed?
- Will the selected parameters meet the proposed wall, pin, overhang and hole dimensions?
- What heat treatment or stress-relief cycle is required before cut-off and machining?
- How will enclosed powder be removed and verified?
- Which surfaces can be inspected directly, and what measurement uncertainty applies?
- What changes will the bureau make to the build file, and how will those changes be approved?
What are the most common preparation failures?
Most failures come from treating export as the final design step. Use the symptom to identify which earlier decision was missed.
| Symptom | Likely preparation issue | Corrective action |
|---|---|---|
| Part is the wrong size in the build preview | Unit mismatch or an exporter scale setting | Re-export with explicit units, measure the bounding box and approve a corrected mesh revision. |
| Visible facets on a curved or sealing surface | Coarse tessellation | Reduce chordal deviation locally or globally, then validate against the CAD master. |
| Warped edge or failed island | Unsupported overhang, unstable start or unfavorable thermal path | Reorient, add a stable connection or redesign the overhang; have the supplier run a support review. |
| Rough down-facing finish | Surface lies in the marginal overhang range | Change the angle, add supports or move the surface into a machining zone. |
| Powder remains inside | No escape route, undersized opening or inaccessible channel | Add or enlarge vents, provide a second opening and confirm the cleaning method before printing. |
| Thread or bearing fit fails | As-built surface and distortion used instead of a finishing plan | Add machining stock, specify the final operation and inspect after heat treatment and machining. |
| Support scars damage a critical face | Support placement was left to automatic defaults | Move supports to sacrificial areas, change orientation or add machining allowance. |
What is the final pre-release check?
Before sending the job, verify that the geometry, process assumptions and finishing instructions agree. The following sequence catches the expensive errors that a file-open test will not.
- Confirm process, alloy, machine, build volume and post-processing with the supplier.
- Open the native CAD and verify that every intended body is a valid solid.
- Export STEP plus the agreed STL or 3MF; check units, scale, body count and dimensions.
- Run mesh repair and inspect curved, thin and internal features.
- Approve the build orientation and support-contact map.
- Check walls, pins, aspect ratios, overhangs, holes and powder-escape paths against the supplier’s current guide.
- Verify machining allowances, thread strategy, heat treatment and inspection datums on the drawing.
- Send the release package and obtain written confirmation of build volume, supports, cleaning, cut-off, finishing and inspection before production.
Frequently Asked Questions
Can I send only an STL if the service bureau accepts it?
You can, but retaining the native CAD and drawing protects the design intent when the bureau finds a scale, support or tolerance issue. A STEP master also lets you issue a controlled revision instead of editing triangles or relying on an undocumented repair.
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No. 3MF can carry richer project information in workflows that support it, while STL remains the most widely encountered mesh format. The practical choice is the format the bureau’s build-preparation software imports without changing units, orientation or body structure.
Can powder-escape holes be plugged after printing?
Often, but the plug becomes part of the pressure, corrosion and fatigue design. Specify the plug material, seal method and inspection requirement before printing, and make sure the opening can be cleaned and inspected before it is closed.
How can I print an internal channel that cannot be reached by a tool?
Design a cleaning route with openings at suitable ends or low points, and use a self-supporting profile where possible. If powder removal or inspection cannot be demonstrated, redesign the channel or divide the part rather than assuming it will be clear.
What information does a metal-printing quote need besides the 3D file?
Provide the alloy, intended orientation, critical tolerances, surface-finish targets, support restrictions, powder-removal plan and post-processing requirements. Those details determine whether the quoted job is an as-built component, a machined component or a heat-treated and inspected component.
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