From $110 to $1.05: How One 3D Printer Changed an Entire Machine Shop

A production manager with zero additive manufacturing experience replaced a CNC-machined stainless steel coupling with a 3D printed composite version, then stress-tested it continuously for a week. The result? No wear, no failure, and no reason to go back to the mill.

What started as a simple experiment at Air & Liquid Systems became a complete shift in how the company approached manufacturing, tooling, and production efficiency.

The Results That Got Everyone's Attention

The numbers alone were difficult to ignore.

The original machined coupling cost roughly $110 per part. The printed composite replacement cost just $1.05. That's a 99% reduction in part cost.

But the savings were only part of the story. The printed version also solved a design problem the machining process never could. The original coupling had a star-shaped internal profile that was nearly impossible to produce accurately on a Bridgeport mill, so the team had been machining a simplified square-shaped approximation instead. The printed version reproduced the exact intended geometry with no additional complexity or tooling.

Even more importantly, the printed parts survived continuous actuation testing for an entire week, simulating roughly five years of service life, without measurable wear or deformation.

For a team that had never worked with additive manufacturing before, that test completely changed their perception of what 3D printing could actually do on a production floor.

The Part That Triggered the Shift

Ryan Wenzlick, Production Manager at Air & Liquid Systems, was dealing with a problem that many machine shops know too well: a small but frustratingly difficult part that consumed time, tooling, and labor disproportionate to its size.

The coupling's geometry caused constant machining headaches. End mills broke frequently. Skilled machinists had to babysit the process. Setup and fixturing added additional labor. And despite all that effort, the final part still wasn't geometrically ideal.

Once the company brought in its first industrial composite 3D printer, the team decided to try replacing the part entirely.

Within weeks, the coupling had gone from an expensive machining problem to a low-cost printed production component.

Why the Printed Part Actually Performed Better

A common assumption in manufacturing is that printed parts are only suitable for prototypes or fit-checks. That assumption often comes from comparing low-end desktop plastic prints to production-grade industrial additive systems.

What Air & Liquid Systems discovered was that the printed coupling wasn't just cheaper — it was functionally superior.

The machined version had compromised geometry because traditional tooling couldn't reproduce the intended star profile efficiently. Additive manufacturing had no such limitation. The printer produced the exact geometry directly from the CAD file without extra setups, custom tooling, or additional labor.

That design freedom matters more than many teams initially realize.

Complex internal channels, organic forms, thin-wall sections, and non-standard profiles are often extremely expensive to machine but relatively straightforward to print. In many cases, the geometry that makes a part difficult for subtractive manufacturing is precisely what makes it ideal for additive manufacturing.

The One-Week Stress Test That Changed Everything

Rather than relying only on cost comparisons, Ryan's team validated the part under real operating conditions.

Two printed couplings were installed into working valves and subjected to continuous actuation for an entire week. The test represented approximately five years of normal service conditions.

When the components were inspected afterward, the team found no visible wear, no deformation, and no mechanical failure.

That result eliminated much of the skepticism surrounding additive manufacturing inside the facility.

Instead of viewing 3D printing as a prototyping tool, the team began treating it as a legitimate production process capable of manufacturing functional mechanical components.

What Makes a Good First 3D Printing Candidate?

Not every machined part belongs on a printer. But certain categories consistently deliver strong returns when companies begin adopting additive manufacturing.

The coupling at Air & Liquid Systems checked nearly every box for an ideal first application:

• Complex geometry that was difficult or expensive to machine
• Frequent tooling wear and broken cutters
• High labor involvement
• Relatively low production volume
• Functional requirements that composite materials could handle
• Repeated setup and fixturing requirements

Those same characteristics exist in many production environments.

Parts that often make excellent early additive candidates include:

• Small machined components with internal or non-standard geometry
• Fabricated plate assemblies requiring cutting, drilling, and welding
• Retention clips, clamps, and custom hardware
• Low-pressure fluid fittings and couplings
• Assembly tooling, drill guides, and inspection fixtures
• Low-volume custom replacement parts

In many cases, the biggest gains come from eliminating labor-intensive setup operations rather than simply reducing raw material cost.

The “Zero Experience” Factor

One of the most important parts of this story is that Ryan's team had no prior additive manufacturing background before purchasing their first machine.

No one specialized in industrial 3D printing. No one had deep composite experience. No one had spent years designing for additive manufacturing.

That situation is more common than many manufacturers realize.

Most production teams assume they'll need months of training or dedicated specialists before they can use additive systems effectively. But modern industrial workflows are increasingly designed around manufacturing teams, not research labs.

Before even unboxing their machine, Ryan's team completed training through Markforged University and quickly moved into production applications.

The learning curve turned out to be far less intimidating than expected.

That doesn't mean design-for-additive principles are unimportant. Orientation, reinforcement placement, infill strategy, and layer direction all affect final part performance. But those concepts are practical manufacturing skills that production teams can learn through application, not years of specialization.

The Bigger Shift Was Cultural

The cost savings on the coupling justified the experiment. But the more important transformation happened afterward.

According to Ryan, the team stopped asking, “Can we print this?” and started asking, “Why are we still machining this?”

That mindset shift changed how engineers and production staff evaluated parts across the facility.

Parts that had always been machined by default were suddenly reconsidered. Assemblies involving multiple welded components became single printed parts. Hardware that previously required supplier lead times could now be produced on demand.

Eventually, the printer stopped functioning as an R&D tool and became part of normal production infrastructure.

Ryan described the machine as running “almost nonstop” and “always making money.”

For many OEM manufacturers and smaller production facilities, that operational flexibility becomes one of additive manufacturing's biggest advantages. It allows smaller teams to produce highly customized, low-volume components without the overhead traditionally associated with custom manufacturing.

Other Parts the Team Moved to Print

Once the coupling succeeded, Air & Liquid Systems expanded into other applications.

Plate assemblies that previously required cutting, drilling, machining, and welding were consolidated into single printed components.

Retention clips and hardware were redesigned with gussets, radiused transitions, and optimized geometries that would have added substantial machining complexity using traditional methods.

Because additive manufacturing doesn't penalize geometric complexity the same way machining does, the printed parts often became both simpler to produce and mechanically stronger.

What Production Teams Should Take Away From This

The most valuable insight from this case isn't simply that one coupling became cheaper.

It's that additive manufacturing works best when applied strategically.

The highest-value opportunities are rarely the easiest parts to machine. They're the parts that consume excessive labor, break tooling, require multiple setups, or force geometric compromises because of manufacturing limitations.

That's where additive manufacturing creates the biggest operational advantage.

For many production teams, the right first question isn't:“What can we replace with 3D printing?”

It's:

“What parts in our facility already frustrate us to manufacture?” That's usually where the strongest additive manufacturing opportunities begin.