Is CNC Machining Dying? A Cost Controller's Answer After 7 Years of Data

Is CNC machining dying? No. But the default—the idea that every metal part has to be programmed, fixtured, and cut from solid stock on a CNC—is what's dying.

I manage procurement for a 120-person contract manufacturing company. For the last 7 years, I've controlled a roughly $340,000-per-year budget for metal components and outside services, negotiated with more than 40 machine shops, and documented every order in our cost tracking system. So when a manufacturing engineer asks me “is CNC machining dying?”, I don't answer with an opinion. I answer with a check register. And the check register doesn't say what the 3D printing hype would predict.

In 2019, about 71 cents of every dollar I spent on metal parts went to CNC machining, mostly at outside shops. In Q4 2024, that figure was 43 cents. During the same period, the number of unique metal part numbers we shipped grew by about 12%, and our cost per accepted part fell by 23%. The CNC didn't die. It just stopped being the default first stop for every metal component.

Why this answer isn't a sales pitch

I'm not an engineer, and I don't have a favorite process. My interest is total cost per good part, and the best way to understand that is to pay invoices for a few years. Most buyers focus on the obvious factors—machine speed, spindle power, or the price on a quote—and completely miss the setup fees, fixture work, inspection costs, and engineering revisions that can add 30-50% to a machining job. The question everyone asks is “which technology is winning?” The question they should ask is “what is my total cost per acceptable part at my real quantity, with my real tolerances and my real revision rate?”

I learned that lesson the expensive way. In 2022, I chose a vendor that quoted $2.85 per part over one quoting $3.20. Per part, that looked like an 11% win. By the time we paid for an unlisted setup, a rejected first article, and the expedite that covered the delay, the cheaper quote cost us about $4,100 more than the alternative. After comparing eight vendors over three months with a shared TCO spreadsheet, we changed our process. Now every quote gets reviewed for hidden line items before it reaches engineering.

What our data actually says about CNC's future

Let's use a real example from our P&L: a stainless actuator bracket for one of our robotics customers. The part has thin webs, a lot of removed material, and most tolerances around ±0.2 mm. Two dowel bores are much tighter. If you described it to a machinist, the machinist would sigh.

We ordered 240 brackets in 2023 through an outside CNC shop. The quoted price was $11.40 per part, plus a $350 setup per batch. We ran six batches: $2,736 in machining and $2,100 in setup fees. Then the design changed twice. Each revision brought reprogramming, re-fixturing, and re-inspection: $780 and $1,150. By the end of the year, that bracket had cost us $6,766, or about $28.19 per accepted part.

Starting in 2024, we made the same bracket in-house on a Desktop Metal Production System P-50 binder jet line. Powder, binder, debinding, sintering, argon, and furnace operator time tracked through 2024 came to roughly $8.90 per part. A separate cleanup pass on the tight bores and one sealing face added another $2.20—because that bracket still had to visit our desktop metal CNC machine afterward. Total tracked cost: $11.10 per accepted bracket. No setup charge per batch. No extra fee when the design changed.

That's the shift people miss. The printed bracket is not a finished bracket. It's a near-net bracket that still needs CNC for the features a machinist would call critical. Cutting a complex shape from a solid block was replaced by printing the shape and then machining only what matters.

Is CNC machining dying? Look at the routing slip. That bracket still hits a spindle for about 20 minutes. The difference is that it no longer consumes a spindle for an hour and a half, five setups, and two revision cycles. That's how a default dies. Not with a bang. With a routing change.

The quieter shift: marking, engraving, and plastics

The same pattern showed up in work that has nothing to do with metal 3D printing. Marking, for example. We used to engrave logos, serial numbers, and date codes on a mill. That meant a production part sat in a $100-per-hour spindle while a tiny engraving cutter moved slowly across its surface. Our desktop laser engraving machine for metal handles that now. It marks logos, UID codes, and data matrix codes without tooling. It paid for itself in about nine months of recovered spindle time.

Plastics also stopped competing for time on metal equipment. A plastic laser cutter machine cuts the acrylic covers, fixture guards, and assembly aids that we once routed or sent out. When that machine needed maintenance in December 2024, we replaced its 130W CO2 laser tube with power supply. The invoice from our supplier was $862, and the old tube had logged roughly 1,850 hours. Check current prices before you budget; they move.

None of this was part of a master plan to kill CNC. Each purchase started with a recurring job that was eating machining hours and didn't need them. Removing marking and acrylic cutting from the CNC queue freed up spindle time for work the mill is actually good at.

Where this analysis breaks down

Before you take this article and cancel a machine shop order, here are the limits. If you make 200,000 identical parts per year with stable drawings and one or two setups, a well-utilized CNC will likely beat a binder jet on cost per part. Our numbers come from a high-mix, low-to-mid-volume shop. If your world is different, the percentages flip.

Also, don't confuse the tools. A desktop metal CNC machine is not a Desktop Metal 3D printer. The P-50 we run is a production-scale binder jet platform, not a desktop device. And the desktop metal CNC machine in our shop doesn't replace a full-size machining center. It does small, precise cleanup work. Buy based on the job, not the name.

Finally, don't ignore time. In March 2024, we paid an 18% rush premium to a local CNC shop for a fixture we needed in four days. The spreadsheet said it was overpriced. Reality? Our customer's line was down, and waiting another week would have cost multiples. The certainty of a delivery date is worth real money. Any TCO model that treats a two-week lead time and a four-day lead time as the same will lie to you.

If someone asks me again this year whether CNC machining is dying, I'll point them to the P-50 and to the desktop metal CNC machine sitting nearby, cutting the bores that printing couldn't hold. Both machines are busy. The only thing that retired is the idea that one process should get every job. Good riddance.