# Additive vs CNC Machining Metal Parts > Compare additive manufacturing with CNC machining from billet for metal parts: speed, size, tolerances, material use, internal features, and cost. Canonical: https://mesh2metal.com/compare/cnc-machining __Mesh2Metal vs CNC machining from billet__ | Criterion | Mesh2Metal | CNC machining from billet | | --------------------------- | ------------------------------------------------------------------------------------------------------------------ | ----------------------------------------------------------------------------------------------- | | Lead time | Made in under 1 day; delivery next day to 5 days by part size | Commonly quoted at 3–7 business days | | Maximum part size | 800 × 800 × 600 mm; larger on request | Depends on machine envelope, billet size, and supplier capacity | | Tolerances | Critical features finished by precision machining: ±0.1 mm standard, ±0.05 mm precision; as-built surfaces ±0.5 mm | Very tight tolerances are a CNC strength; final tolerance depends on design and inspection plan | | Material waste / buy-to-fly | Built near-net shape can reduce billet demand for complex forms | Buy-to-fly can rise when much of a billet sits outside the final geometry | | Internal features | Complex internal channels, subject to manufacturability | Open, accessible geometry is usually the simpler fit | | Multi-material | Up to 3 alloys in one part | Usually planned as separate parts or material selections | | Hard-to-machine alloys | Near-net shape can reduce starting-material demand | Mature supply and established practices can favor CNC | | Quality documentation | Every part ships with a quality certificate | Documentation depends on supplier and purchase order | | Quantities | 1–200; no tooling | Repeat quantities can improve economics for established supply | | Cost drivers | Geometry, size, alloy, quantity, finish, and documentation | Billet size, machine time, alloy, setups, tooling, finish, and documentation | Additive vs CNC machining metal parts comes down to geometry, tolerance, and schedule. CNC machining from billet is often best for simple prismatic parts and very tight tolerances. Mesh2Metal is a strong fit for large or complex parts, internal channels, up to three alloys in one part, and parts made in under 1 day. ## When should you machine vs 3D print metal? Choosing between CNC machining from billet and additive manufacturing starts with the part’s shape, tolerance plan, size, alloy, quantity, and schedule. CNC machining from billet usually wins for simple prismatic parts, very tight tolerances across many features, and a mature supply path. Mesh2Metal usually wins when a part is large or complex, contains internal channels, needs multiple alloys, uses a hard-to-machine alloy, or must be made in under 1 day. Neither route wins every time. The right answer is the route that meets function, quality records, and delivery date without paying for capability the design does not need. | Decision point | CNC machining from billet | Mesh2Metal | | ------------------------- | --------------------------------------------- | ------------------------------------------------- | | Simple prismatic geometry | Strong fit | Consider when speed or material use matters | | Very tight tolerances | Strong fit | Critical features finished by precision machining | | Large or complex geometry | Cost and size can rise | Strong fit up to 800 × 800 × 600 mm | | Internal channels | Review access and geometry | Strong fit, subject to manufacturability | | Multi-material | Usually separate parts or material selections | Up to 3 alloys in one part | | Speed | Commonly quoted at 3–7 business days | Made in under 1 day | ## How do lead time and maximum size compare? Lead time and maximum size make the first practical filter. Mesh2Metal parts are made in under 1 day. Delivery runs from the next day to 5 days depending on part size, and the exact date comes with the instant quote. Maximum standard part size is 800 × 800 × 600 mm; larger parts are considered on request. CNC machining from billet is commonly quoted at 3–7 business days. CNC remains useful when size is modest and supplier capacity is predictable. Mesh2Metal is compelling when a complex design would otherwise require several handoffs or long scheduling. ## How do tolerances and surface finish compare? Tolerances and surface finish should follow the function of each feature. CNC machining is a strong choice for very tight tolerances and established inspection plans. Mesh2Metal uses additive manufacturing; parts are built near-net shape, then critical features receive precision machining. Standard machined features are ±0.1 mm, with ±0.05 mm precision available. As-built surfaces are ±0.5 mm. Machined surface finish is Ra 3.2 µm standard, with 1.6 µm optional; as-built finish is Ra 12–25 µm. Designers should keep critical dimensions and surface requirements explicit in CAD and review the [manufacturability check](https://mesh2metal.com/manufacturability) before choosing a route. ## How does buy-to-fly affect material cost? Material use and buy-to-fly often separate a good fit from an expensive one. CNC machining from billet can be efficient when the finished part uses a high share of its billet. Buy-to-fly can rise when a large billet is needed for a complex or deep form, even if the finished mass is modest. Mesh2Metal builds near-net shape, which can reduce starting-material demand for complex parts and save material. Actual savings depend on geometry, alloy, size, and finish requirements. The [instant quote](https://mesh2metal.com/quote) is the practical comparison: test the same CAD, quantity, alloy, and finish against both routes. ## When do internal channels and multiple alloys matter? Internal channels and multiple alloys can change the route decision even when the outside dimensions look similar. CNC machining is often the clean answer for open, accessible, prismatic geometry. Deep enclosed channels and other internal features can increase design constraints, cost, or lead time. Mesh2Metal can handle complex internal channels when the geometry passes manufacturability review. Mesh2Metal can use up to three alloys in one part. That can help a design combine material properties without turning every function into a separate part. Confirm interfaces, dimensions, and quality needs early. See [multi-material parts](https://mesh2metal.com/multi-material) for design guidance. ## Which option fits hard-to-machine alloys and quality records? Hard-to-machine alloys and quality documentation can favor different routes. CNC machining can be the mature-supply choice when the alloy is readily available and the design is simple. Mesh2Metal is a strong fit for hard-to-machine alloys because near-net shape can reduce starting-material demand. Available families include [aluminum](https://mesh2metal.com/materials/aluminum), [copper](https://mesh2metal.com/materials/copper), [stainless steel](https://mesh2metal.com/materials/stainless-steel), [titanium](https://mesh2metal.com/materials/titanium), [nickel alloys](https://mesh2metal.com/materials/nickel-alloys), and [tool steel](https://mesh2metal.com/materials/tool-steel). Every part ships with a quality certificate covering chemical composition, porosity and defect map, 3D deviation from CAD, mechanical and thermal properties, traceability, and certificate of conformance. CNC documentation depends on supplier and purchase order; specify required records before buying. Read more about the [quality certificate](https://mesh2metal.com/quality). ## How do quantities and cost drivers change the answer? Quantities and cost drivers determine whether a capable route is also economical. Mesh2Metal supports quantities of 1–200 with no tooling. CNC machining often becomes attractive for repeat quantities when simple geometry, very tight tolerance, and mature supply outweigh longer scheduling. For either route, cost depends on part size, geometry, alloy, quantity, surface finish, inspection scope, and quality documentation. Mesh2Metal can be a better value for one-off and short-run complex parts because no tooling is required and parts are made in under 1 day. CNC can be a better value for straightforward prismatic parts repeated through an established supplier. Compare the full delivered requirement, not only the hourly rate. ## What should engineers check before choosing? A CAD comparison should use the same geometry, alloy, quantity, tolerance callouts, surface finish, and quality records for both routes. Drop your CAD as STL, STEP/STP, 3MF, or OBJ; files are analyzed locally in the browser and never leave your device. The [instant manufacturability verdict](https://mesh2metal.com/manufacturability) arrives in under 60 seconds. If a design cannot be made, Mesh2Metal says why and how to fix it. Use [how it works](https://mesh2metal.com/how-it-works) to review the path from CAD analysis to a quote, then compare the exact requirement at [/quote](https://mesh2metal.com/quote). Choose CNC for simple prismatic parts, very tight tolerances, and mature supply. Choose Mesh2Metal when large or complex geometry, internal channels, multiple alloys, hard-to-machine alloys, material efficiency, or speed matter most. ## Questions When should I machine a metal part instead of using additive manufacturing? Choose CNC machining from billet for simple prismatic geometry, very tight tolerances, or an established high-volume supply path. Mesh2Metal fits complex geometry, larger parts, internal channels, or near-net shape material savings. Can Mesh2Metal match CNC tolerances? Mesh2Metal finishes critical features by precision machining. Standard machined tolerance is ±0.1 mm, with ±0.05 mm precision available; as-built surfaces are ±0.5 mm. Is additive manufacturing cheaper than CNC? Neither route is always cheaper. Compare geometry, alloy, size, quantity, finish, and documentation; Mesh2Metal provides an instant quote after browser analysis. How fast can Mesh2Metal make a part? Parts are made in under 1 day, with delivery next day up to 5 days depending on part size. The exact date comes with the instant quote. Sources (3) 1. \[1\] [ Additive manufacturing ](https://en.wikipedia.org/wiki/3D%5Fprinting) , Wikipedia 2. \[2\] [ Machining ](https://en.wikipedia.org/wiki/Machining) , Wikipedia 3. \[3\] [ Geometric dimensioning and tolerancing ](https://en.wikipedia.org/wiki/Geometric%5Fdimensioning%5Fand%5Ftolerancing) , Wikipedia ## Check your part now. Analyzed in your browser — your file never leaves your device. [ Set up API ](https://mesh2metal.com/api#setup) [ Set up MCP ](https://mesh2metal.com/mcp#setup) [ Drop your CAD STL · STEP · 3MF · OBJ ](https://mesh2metal.com/quote)