Fictiv and Xometry for CNC Machining: What Actually Differs

• 1
  Fictiv vs Xometry vs a single-source CNC shop
• 2
  Which route fits which job
• 3
  Where Fictiv and Xometry for CNC machining diverge
• 4
  Broker network versus owned capacity
• 5
  Who actually holds ±0.005 mm
• 6
  DFM feedback you can act on
• 7
  Prototype, bridge, and production runs
• 8
  Materials, finishing, and the second supplier problem
• 9
  Certifications, traceability, and NDAs
• 10
  Where the price actually comes from

Both platforms sell the same promise: upload a STEP file, pick a material, get a price. Fictiv runs a curated network of vetted partner shops. Xometry runs a much larger open network and matches your job to whatever supplier has capacity. Neither platform owns the spindle that cuts your part.

That single fact drives most of the difference. On a platform, the shop that quotes your prototype may not be the shop that runs your 500-piece order. Materials, fixtures, and even the CAM program get rebuilt at the next stop. For a simple bracket that costs nothing. For a part with a true position callout of 0.05 mm, it can cost a whole re-qualification cycle.

A single-source shop keeps the same machines and the same programmers on the job from first article to production. When a dimension drifts at piece 300, the person who wrote the program is standing ten meters from the machine. That is the trade: less supplier choice, more process continuity.

Fictiv and Xometry both act as brokers. They take your order, route it to a supplier, and handle the transaction. The upside is real: instant pricing, wide material coverage, and capacity that scales past what any one shop can hold. If you need 40 shops' worth of turning capacity in a week, a network is the only answer.

The downside is variance. Your part may run on a 3-axis mill in one city and a mill-turn center in another, depending on who bids. Surface finish, deburring habits, and inspection discipline follow the supplier, not the platform. Two orders of the same part can arrive looking like they came from different companies, because they did.

An owned shop removes that variable. GreatLight runs 127 high-precision CNC machines across three wholly-owned plants, including 16 simultaneous 5-axis machining centers, 12 four-axis mills, 27 three-axis machines, and 16 mill-turn centers. The machine that proves out your prototype is available for the production run.

• 1
  Platform strengthElastic capacity and instant pricing across many suppliers
• 2
  Platform riskSupplier changes between prototype and production
• 3
  Owned-shop strengthSame machines, programmers, and inspection path throughout
• 4
  Owned-shop limitCapacity is bounded by the shop's own equipment

A platform quote does not guarantee a tolerance. It reflects what the bidding supplier believes it can hold. Ask for ±0.005 mm on a 200 mm aluminum housing and the answer depends entirely on which shop picks up the job, and whether its CMM is calibrated for that callout.

When a shop owns the process, tolerance is a commitment rather than an estimate. At GreatLight, ±0.005 mm (±0.0002 in) is a standard capability on 5-axis work, with surface finish from Ra 0.2–0.8 μm on fine-finished faces up to Ra 1.6–3.2 μm as-machined. Inspection is 100% before shipment: raw material check, in-process monitoring, final inspection, reports on request.

This matters most on parts where one dimension carries the function. A bearing bore, a seal groove, a mating face on a valve body. If that feature is wrong, the part is scrap no matter how good the rest looks. Tolerance control is not a line item you can outsource to a bidding process.

Platform DFM is usually automated. You get a flag: thin wall, deep pocket, tight corner. Useful for catching obvious mistakes, but it does not tell you what to change or why. A machinist looking at the same file will say the 2 mm floor on a 40 mm deep pocket needs a 6 mm end mill, which means either a corner radius change or an EDM step.

That kind of note only comes from someone who will run the job. When the DFM reviewer and the machinist are the same team, feedback turns into a drawing revision instead of a support ticket. It also arrives fast. GreatLight returns a quotation and a free DFM analysis within 12 hours, and production can start within 24 hours once the revision is agreed.

For a prototype this saves a week. For a program with ten parts in the same enclosure, it saves ten separate rounds of the same conversation.

Platforms are at their best in the middle of the volume curve. A 20-piece bridge order with three material options and a two-week window is exactly what a network is built for. Prices are competitive because suppliers bid against each other, and you do not need to build a relationship to place the order.

Below that, at one to five pieces, a platform's overhead starts to show in the price. Above a few thousand pieces, unit cost drops faster when the shop can plan tooling, fixtures, and cycle time around your part instead of quoting it cold. GreatLight has no minimum order quantity, from one prototype to 10,000+ part runs, so the same shop serves both ends.

The practical rule: use a platform when the part is simple, the volume is uncertain, and speed beats process control. Use a single-source shop when the part is hard, the volume is known enough to plan, or the same design will come back next quarter.

Most CNC platforms cover aluminum, stainless, steel, and a few plastics well. The gaps appear at the edges: titanium, Inconel, magnesium, beryllium copper. These are the materials that show up in aerospace, medical, and high-performance automotive work, and they are also the ones where machining parameters matter most.

GreatLight machines 6061, 7075, 2024, and ADC12 aluminum; 303, 304, 316L, 17-4PH stainless; 4130, 4140, 4340 steel; C36000 brass and beryllium copper; plus TA2, TC4 (Ti-6Al-4V), Inconel, and AZ31B magnesium. Finishing stays in the same building: anodizing, electroless nickel, zinc, silver and gold plating, powder coating, black oxide, bead blasting, tumbling, brushing, polishing, and laser marking with a minimum character height of 1.5 mm.

Keeping finish in house removes a second supplier from the schedule. That second supplier is where lead times usually slip, because anodizing and plating queues are short and unforgiving.

Platform certifications belong to the partner shop, not to the platform. If your quality system requires IATF 16949 or ISO 13485 evidence, you need the certificate of the entity that actually machined the part. That entity can change between orders, which makes traceability harder to maintain across a program.

A single-source manufacturer holds its own certificates. GreatLight carries ISO 9001:2015, IATF 16949:2016, ISO 13485:2016, and ISO 27001:2022. The last one covers information security, which matters when your STEP files and drawings are the customer's intellectual property.

Confidentiality follows the same logic. Uploads are secure and confidential, and an NDA is available on request. With a platform you are trusting the routing layer plus every supplier in the chain. With one shop you have one counterparty to sign with and one place your files live.

Platform pricing is a market price. Suppliers bid, the platform takes its margin, and the number you see reflects both. On simple parts this is hard to beat because the bidding pool is wide. On complex parts the margin stacks on top of a quote that already carries risk pricing, because the supplier is quoting a job it has never run.

A single-source shop prices from its own cycle times and its own tooling. On repeat work that gets cheaper over time, because fixtures and programs already exist. Unit cost on a 5,000-piece run reflects optimized processes rather than a first-time estimate.

Neither route is always cheaper. The honest answer is that platforms win on simple, low-commitment, capacity-limited jobs, and single-source shops win on complex, repeatable, tolerance-critical work.