A video test of Markforged’s Onyx FR’s flame retardant capabilities

Putting feet to the fire: A video test of Markforged’s Onyx FR’s flame retardant capabilities.

Time to play with matches! Because of the huge potential of an affordable & Flame-retardant composite plastic that can be 3D printed, we decided to put Markforged’s Onyx FR to the test.

In the video, we hung up two sample prints: One of Markforged’s standard-issue, chopped carbon fiber “Onyx” material (labeled ‘O’), and one of Markforged’s brand-new Onyx FR (labeled ‘F’).

After taking a blowtorch to the original Onyx Material for nearly 10 seconds, we saw it catch fire and start dripping melted plastic before the 10 seconds was even over! Putting the FR material in the blowtorch’s “hot-seat” for over 10 seconds barely affected it! As soon as we pulled the blowtorch away, the flame flickered out – not even a second later!

Below, you’ll find a short video showing the aftermath:


Designing a Carbon Fiber Bike


When I am not installing Markforged printers or teaching customers SOLIDWORKS, I do long distance charity rides. These are often 50, 75, or 100 miles in 1 or 2 days. In order to ride these distances, I need to have a bike that’s both comfortable and fast. My ride of choice is a short wheel base recumbent, the Vision R40. The short wheel base fits my frame better than a road bike and gives me an added layer of comfort during the long ride. However, increased comfort means increased weight. The R40 weighs 32 points, more than twice as much as a light road bike would. One of my favorite rides of the season is the Three Notch Century. Unfortunately the weight of the chromoly frame for my Vision R40 is less than ideal for the hill climbs through the New Hampshire White Mountains. A lighter bike could make a huge difference on these long, hilly rides.

A stock photo of a Vision R40 recumbent bicycle

‍The Vision R40 recumbent bike weighs 32 pounds.

A Homemade Carbon Fiber Bike

With the strong parts that Markforged printers can create, I realized that I could create a much lighter bike affordably. A complete replacement frame and seat assembly made of 3D printed components bonded between cut sections of carbon fiber tubing is a strong, manufacturable, and affordable frame. There are just 10 unique Onyx printed components in the final assembly and 7 different sections of pre-made, bicycle frame sized, carbon fiber tubing. Some parts and tubes are used in 2 – 4 different instances within the overall assembly. The front fork, stem, and handle bars have already been purchased from eBay in carbon composite. Material costs run at about $900, which more than a $1000 cheaper than a custom built composite frame. Couple that the ability to customize the design for myself, and you have a winning formula for a carbon fiber bike.

a realistic render of the planned bike

‍A system CAD render of the proposed bike. The frame is comprised on stock carbon fiber tubes, connected together by Markforged connectors

The First Part

Designing a composite bike frame is one thing; proving that it’ll be lighter and strong enough is a completely different story. In order to validate my design, I printed the first element of the new frame: a left rear dropout. This part holds the rear wheel in place, so it needs to be incredibly stiff. I designed it in Solidworks and uploaded it to Eiger. I decided to use Onyx material with a few layers of High Strength High Temperature Fiberglass reinforcement. The Onyx is tough and stiff and HSHT is strong, giving the part the characteristics that needed.

A screenshot of Eiger displaying the rear dropout of the bicycle

‍The Rear Dropout, laid out in Eiger.

I printed the part on a Mark Two Enterprise kit printer. As printed, this frame component is just 26.7 grams. An equivalent metal component would be 115 grams or more. With this part, I know that the build is feasible and am pressing forward with fabrication.

the final dropout, finished

‍The printed dropout. It came out great!

Printing A2 Tool Steel at the DEX EXPO

Video Transcript:

Hello Everyone, this is Matt Jones from Miller 3D. We’re at the Design and Engineering eXpo (DEX) in Sherbrook, Quebec today and we have the Mark Two, the Metal X, and the Markforged X7 all printing parts today.

The New A2 Tool Steel: First Run

What I wanted to show you is that on the Metal X, we’re using the new A2 Tool Steel. We completed our first print with A2 today. It’s this little gear part here.

Why A2 is important: Tough Stuff!

A2 is very good for tooling & fixturing, and a lot of manufacturers/machine-shops like A2 because of the hardness that they can achieve. Right out of the sinterer, it will be around 52 Rockwell, and then you can heat treat it up to 60-62 Rockwell if you need to.

Contact us to learn more about A2 tool steel

So there you go; this is our first print with A2 tool steel. If you’d like to learn more about Markforged, The Metal X, or composites, you can reach us at Miller3DPrinting.com.