Markforged Industrial 3D Printing: What I Learned From $8,000+ in Mistakes

What I Wish Someone Had Told Me Before Buying a Markforged 3D Printer

I'm a manufacturing engineer who's been handling additive manufacturing orders for about 6 years now. I've personally made—and documented—15 significant mistakes on Markforged platforms alone, totaling roughly $8,200 in wasted budget. That's not counting the time. I now maintain our team's checklist to prevent others from repeating my errors.

This isn't a spec sheet. This is the FAQ I wish I'd had before our first purchase in 2019. If you're evaluating a Markforged Onyx One, FX10, or Metal X, these are the questions you should actually be asking.

1. Is a Markforged 3D Printer Worth the Price Compared to Desktop Alternatives?

Short answer: Depends entirely on what you're making. I get why people look at a Bambu Lab or Creality and think, why pay 10x more? To be fair, those machines are incredible for prototyping and hobbyist work.

But here's the blind spot most buyers have: they compare upfront printer cost and ignore material properties and certification. The question everyone asks is "what's the per-kg material cost?" The question they should ask is "can this part survive a 100°C environment under continuous load?"

We tested a Markforged Onyx part against a standard FDM PLA part for a jig in our assembly line. The PLA part deformed at 55°C. The Onyx part (with continuous carbon fiber reinforcement) held its shape at 85°C and carried a 12 kg load for 3 months without creep. That jig failure would have cost us roughly $400 per hour of downtime. The printer paid for itself in 4 months on that application alone.

That said, if you're printing prototypes that live on a desk, a desktop printer is fine. Markforged makes sense when you need production-adjacent parts that traditional machining can't deliver fast enough.

2. Markforged Metal X vs. CNC Machining: Which Is Better for Metal Parts?

I still kick myself for not understanding this sooner. When we got our Metal X in 2021, I assumed we'd be replacing CNC work immediately. That was naive.

Here's the reality: The Metal X prints 17-4 PH stainless steel and some tool steels. The parts come out of the furnace with roughly 95-98% density, which is good—but not CNC-grade good for high-stress applications. We learned this the hard way when a printed clamping fixture failed at 70% of the load our CNC'd part could handle.

Where the Metal X excels is complex geometries. We made a cooling channel insert for an injection mold (think: EC85SXIIIV70 type applications) that would have cost $1,200 to CNC and taken 3 weeks. The Metal X did it in 4 days for $380 in material. The surface finish needed some post-processing, but the function was identical.

So which is better? They're different tools. CNC is better for high-volume, tight-tolerance metal parts. Metal X is better for low-volume, custom geometries where traditional machining hits a complexity wall. Don't let anyone tell you it's a replacement—it's a complement.

3. What Are the Real Material Limitations of Markforged Printers?

This is where I made my biggest mistake. In September 2022, I printed a batch of 40 Onyx parts for a client in the aerospace sector. They passed our internal checks. The client rejected them because the surface porosity on the Onyx material wasn't suitable for their sealing application.

The mistake? I assumed "carbon fiber" meant "airtight." It doesn't. Standard Onyx is porous at the microscopic level. If your application requires fluid sealing or a specific surface finish, you need to factor in post-processing—either vapor smoothing or a sealing coat.

Here's what I've learned about the main Markforged materials:

• Onyx (short carbon fiber nylon): Excellent stiffness and heat resistance (up to ~145°C). But not airtight. Great for jigs, fixtures, and structural brackets. Don't use for fluid-handling parts.
• Continuous Carbon Fiber (CCF): This is where the magic happens. The strength-to-weight ratio rivals 6061 aluminum for certain load cases. But it's anisotropic—strength is excellent along the fiber direction, weaker perpendicular. Design for that.
• Metal (17-4 PH SS, H13, Inconel 625): Good density but not 100%. Expect 95-98%. Acceptable for many tooling and end-use applications. Not for aerospace flight-critical parts without validation.
• Ultem 9085 (on the FX10): This is a game-changer for high-temp, flame-retardant needs. But it's tricky to print. Don't expect it to look pretty. The strength is what matters.

Take this with a grain of salt: my experience is based on about 100+ unique builds across Onyx Pro, X7, and Metal X. Your results may vary with newer materials.

4. Can Markforged Printers Handle Aerospace and Defense Certification Requirements?

This is a question I get from engineers in aerospace and defense a lot. The short answer is: yes, but with caveats.

Markforged does offer certified platforms, and the Digital Forge software includes traceability features. We've used it for non-structural interior brackets and tooling for a defense contractor. The audit trail—print settings, material lot numbers, build parameters—met their requirements.

But here's what I'd caution: don't assume certification is automatic. We had a part rejected in Q1 2024 because our post-processing step (tumbling) wasn't documented in the Digital Forge log. We fixed the process, but it cost us a 2-week delay.

Per AS9100 standards (effective 2023 revision), any additive manufacturing process for flight-critical parts requires full validation. Markforged can help with the data, but you still need to do the qualification work yourself. If you're expecting a "certified part" button, it doesn't exist yet.

For non-flight-critical applications like ground support equipment, fixtures, and interior brackets? Absolutely. We've had parts in use for 18+ months without issues.

5. What Industries Rely on CNC Milling Services, and Should I Even Consider 3D Printing Instead?

I hear this question a lot from teams evaluating whether to switch from CNC milling to additive. The honest answer: it depends on your industry and part requirements.

Industries that heavily rely on CNC milling include:

• Aerospace & Defense: High-tolerance structural components, engine parts, brackets—where material integrity and traceability are non-negotiable.
• Automotive: Engine blocks, transmission components, custom tooling for production lines.
• Medical Devices: Surgical instruments, implants (where biocompatibility and surface finish matter).
• Energy & Oil & Gas: Valve bodies, pump components, high-pressure fittings.

But here's the pattern I've observed: these same industries are increasingly using additive for low-volume tooling, fixtures, and replacement parts. For example, a CNC shop might mill 500 identical brackets—that's a CNC job. But if they need 5 custom jigs with internal cooling channels that no standard end mill can reach? That's an additive play.

In our experience, we've shifted about 15% of our low-volume metal part production to Metal X, and about 30% of our plastic/composite part production to Onyx and CCF. The rest stays CNC. The cost crossover is usually around 10-50 units per design, depending on complexity.

Bottom line: don't ask "which is better." Ask "what's the best tool for this specific part, at this volume, within these tolerances?"

6. What's the Most Overlooked Cost When Switching to Markforged?

Everyone focuses on printer cost and material cost. No one talks about post-processing equipment and workflow integration.

We bought an X7 and thought we were good to go. Three months in, we realized we needed:

• A deburring station for metal parts (another $2,500)
• A furnace for sintering (already had one, but that's $20k+ if you don't)
• A vapor smoothing setup for Onyx parts (about $1,200)
• Training time for operators (roughly 40 hours per person)
• CAD software adjustments for anisotropic material behavior

Our total upfront cost was 2.3x the printer price. I'm not 100% sure that's universal, but I've heard similar numbers from colleagues at other companies. Budget for it.

7. Should I Start With Markforged Onyx or Go Straight to Metal X?

If I could go back to 2019, I'd start with the Onyx platform. Here's why:

Metal 3D printing has a steep learning curve. The debinding and sintering process adds failure modes we didn't anticipate. Warping, shrinkage (17-22% for some geometries), and surface finish consistency are real challenges. Onyx is much more forgiving.

We started with an Onyx Pro, learned the material behavior, then added a Metal X 18 months later. That ramp-up saved us from what would have been a $3,200 mistake on a metal print gone wrong in our first month.

If your budget only allows one machine and you absolutely need metal parts, go for the Metal X. But expect a 3-6 month learning curve before you get consistent results. If you can start with Onyx, do it. You'll be making useful parts on day one, and the lessons transfer directly to metal.