The Markforged Checklist I Give New Engineers (After $18,000 in Mistakes)

Here's who this is for: you have a Markforged printer, or you're about to get one, and you want it to produce functional parts—not demo pieces. I've been running Markforged machines since 2019, and I've made 14 significant mistakes in that time. Roughly $18,000 in wasted material, labor, and customs fees. I keep the list so the next engineer doesn't have to repeat it.

This isn't the official Markforged setup guide. It's the checklist I actually use.

Step 1: Verify your Markforged login before you touch the machine

This sounds like an IT task, but it bit me hard. In 2021, I spent 45 minutes setting up an FX10 only to discover that the account tied to the machine wasn't our company account. The machine was in a kind of demo mode. Actually, it wasn't demo mode—it just couldn't pull our material profiles. Either way, lost a morning.

Before you start any job:

• Open your Markforged login and confirm you can see the printer in Eiger's fleet view.
• Make sure the printer is linked to the workspace that contains your material profiles.
• Check your user role. If you're a Viewer, you can't start a build. You need at least Operator.

I know it sounds basic. But I've seen a late-night login lockout stall a whole shift. Spending five minutes on this before an order starts is cheaper than diagnosing it after.

Step 2: Read the material datasheet, then question it

The numbers said Onyx would handle a small sensor bracket for a pneumatic fixture. The load was small, and the bracket was chunky. My gut said the thin neck at the sensor mount wasn't going to carry the load over time. I ignored it. The part lasted about three weeks, then crept just enough for the sensor to misread. That cost us an $890 redo plus a one-week delay.

What most people don't realize is that printed parts aren't isotropic. Markforged material datasheets give you mechanical values for test coupons printed in a specific orientation. Your part might be printed at 45 degrees, with a thinner wall, or with fiber strands running in a direction that doesn't match the datasheet. The datasheet isn't wrong—it's just a starting point.

For critical parts, print a sample, test it, then approve the material profile. Not the other way around.

Step 3: Design for the metal insert before you print the plastic

Here's the step most people skip: the most important part of a printed fixture is often the metal insert, not the printed part. On jigs and tooling, your bushing, pivot, or locating pin carries the real load. The printed composite holds it in place, but the machined metal is the surface your operator actually trusts.

In our shop, we machine those metal seats with an adjustable milling cutter. It's a cutter with blades you can tune outward in small increments, which makes it great for getting a precise bore seat. But it only helps if the printed part gives you a straight bore and enough wall to work with. I made the mistake of designing a stepped hole once, thinking it would trap the bushing. It just made the cutter chatter. A bushing pressed into a composite part needs a clean, straight cylinder.

One warning: don't machine away more than about 1mm of composite wall when post-finishing a Markforged part. We lost a carbon fiber bracket because I cut too deep into the fiber layers. It looked fine, then cracked under a light load. Not a design failure—a machining failure.

Step 4: Don't guess the HS code for a laser welding machine

If you're adding a laser welding machine to your production cell, the HS code matters. I learned this in September 2022. We imported a small laser welder for a job that required welding a pin into a printed bracket. The supplier's invoice just said laser welding machine, and our customs broker picked a generic code. The shipment got held for classification. $500 in storage fees and a three-day delay.

I want to say the final code was under 8515.80, but don't quote me on that—the exact code depends on the machine's features and how the local customs office classifies it. What I'll tell you is the lesson: search for laser welding machine hs code before you commit to a supplier. Ask the broker to write the code into the quote. Don't let the vendor hand you a vague freight description and hope.

We did this on an import last month and it cleared in two days. That's the difference.

Step 5: Treat machine interlocks like a car's brake pedal

When you start a car do you press the brake? In most modern cars, yes. It's an interlock. It stops the vehicle from moving while you're turning the key. The printer's door switch, bed clamps, and filament sensors work the same way—they're safety interlocks, not obstacles.

I've seen a Markforged run with the chamber door taped open because someone wanted to watch the first few layers. The print curled, the head hit the stray piece, and we spent a weekend recalibrating. Not ideal, but workable—except it wasn't workable, because the bypass caused the whole failure.

So our checklist now includes a line that sounds ridiculous until it saves you: If you're about to bypass an interlock, stop and ask why. That one line has caught eleven potential shutdowns in the past two years.

Step 6: Print a first article and look at it the way a customer will

The first time I ran a batch of printed inserts for a customer fixture, the dimensions were right, the tolerances were okay, and the parts functioned exactly as designed. But the surface finish was rough, and a couple of edges had minor chips. The customer didn't complain—they just didn't order again.

That's the quality perception problem. The part is your handshake. A $50 difference in material or finishing translated into a lost account worth thousands. Now we print a first article for every job and ask: if a new supplier sent this to us, would we accept it?

As a side note, this is also where I stopped using budget filament for critical parts. When we switched to approved Markforged material profiles, internal client feedback scores improved by 23% over about 18 months. The number sounds too clean, but it's from our review sheets, so I'll leave it there.

One more thing: Know when not to print

A Markforged doesn't replace milling, welding, or every conventional process. It changes the order in which you do them. You still need a cutter for tight bores, and you still need a customs plan when equipment like a laser welding machine crosses a border.

Think about it like online printing. Online printers like 48 Hour Print work well for standard products—business cards, brochures, flyers—where you know the format and you need a guaranteed turnaround. But they're not the right choice for custom die-cut shapes, unusual finishes, or complex final color proofs. The same discipline applies here: use a Markforged for what it does best, and bring in another process for the rest.

Something vendors won't tell you: the first quote for a Markforged cell is not the final price. Once you add training, post-processing, spare parts, and the customs fees for supporting equipment, you can be 20% to 30% higher before the first part comes off the printer.

The value of guaranteed turnaround isn't the speed—it's the certainty. A fixture that shows up on Friday morning, even if it took a little longer, beats a perfect fixture that arrives Monday afternoon.

Last Checklist: The Mistakes That Cost Us

• The Markforged login check: five minutes that saves a shift.
• The material test: print, load, measure—then believe the datasheet.
• The adjustable milling cutter setup: design the straight bore before you print.
• The laser welding machine hs code: confirm it with a broker before shipping.
• The interlock rule: never bypass a safety sensor, even for just one layer.
• The first article: inspect it like a suspicious customer.

I keep this list in our Eiger file. When someone opens the workspace, the first thing they see is the rule: verify before you build. That's the whole point. If you're setting up your own Markforged workflow, steal this list and make it yours.