Thule Embraces Additive Manufacturing with FDM Nylon 12 Carbon Fiber

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Spirit of Adventure Drives Product Design

Active people know Thule. As a global leader in solutions that allow people to “bring with them what they care for most,” the Thule brand name adorns products from car racks and carriers, to luggage and bags, and kids’ accessories. With the Thule Group’s American corporate headquarters and U.S. manufacturing facility located in Seymour, Connecticut, product design and innovation are key drivers for this active lifestyle company.

Thule’s spirit of innovation drew them to early 3D printing for visual models to help with concept validation. But despite the conceptual benefits, these models lacked the functionality necessary for design verification and Thule made the decision to upgrade for greater material range and higher output, giving them the ability to print functional prototypes.

Engineers and designers at the company whose slogan is “Bring Your Life,” were fully on board once they saw the printer’s capabilities. “Our (3D printer) was at capacity, running for 16 to 20 hours a day,” said Rob Humphries, prototype engineer, product development at Thule. “Besides that, our product development team grew here in Connecticut, and we started supporting other Thule manufacturing and design locations as well.” However, one hurdle remained for Thule, the ability to print prototypes with the stiffness and strength of fiber- or glass-reinforced injection molded parts that would enable the company to perform functional performance testing.

From Concept Validation to Functional Testing

Rob Humphries removing an FDM Nylon 12CF part from Thule’s 3D printer.

Rob Humphries removing an FDM Nylon 12CF part from Thule’s 3D printer.

It wasn’t long after Thule purchased their 3D printer when they learned of carbon fiber-reinforced nylon material. “With the Nylon 12 Carbon Fiber, we very quickly had a double argument for this new machine,” said Humphries. “It wasn’t just additional 3D printing capability, but suddenly we were able to conduct functional tests with prototyped parts. It’s been a big advantage that materialized because of this new machine and material.”

Another feature of this material is its ability to withstand Thule’s notorious rigorous functional testing. “Our testing is brutal,” said Humphries. “I don’t think everyone was aware of the possibility of being able to 3D print parts with this level of strength until they began seeing the capabilities of Nylon 12CF.” Demand for time on Thule’s carbon-fiber printer, a Stratasys Fortus 450mc™, shot up once engineers saw the strength and stiffness capabilities of the carbon fiber material. “When people started to see the CF parts passing our more severe tests, engineers started saying ‘oh, I really want my parts made with this material.’”

Nylon 12CF has performed so well for Thule that the company has begun printing assembly fixtures and manufacturing aids for their Connecticut manufacturing plant, as well. “Nylon 12CF has been game-changing for us,” said Humphries. “Nothing that we could get affordably or quickly has the properties that Nylon 12CF does. It lets us more accurately model our production parts, test faster, and get to market faster.”

“It wasn’t just additional 3D printing capability, but suddenly we were able to conduct functional tests with prototyped parts.”

Rob Humphries, Thule

Designers at Thule discuss concept validation for their Hull A Port XT kayak carrier.

Designers at Thule discuss concept validation for their Hull A Port XT kayak carrier.

In addition to being able to print parts capable of withstanding both static testing and drive testing, “every time we print a part in carbon fiber it takes two weeks off the time it would have taken us to send it out,” said Humphries. “It definitely helps with the creativity at Thule.” Engineers print three to four iterations in a week, with the ability to print a new version every night and improve it the next. “If we had to wait two weeks between iterations, a designer’s project schedule would be shot,” said Humphries. “The speed with which we’re able to iterate puts better ideas into design.”

Demand for new product prototypes continues to grow at Thule. “We’ve made rotating parts, like our clamp mechanism that has teeth that fit into each other that wouldn’t hold up without the capabilities of FDM Nylon 12CF. They’d break-off or bend completely over, without breaking,” said Humphries.

“Nylon 12CF has been game-changing for us. Nothing that we could get affordably or quickly has the properties that Nylon 12CF does. It lets us more accurately model our production parts, test faster, and get to market faster.”

Rob Humphries, Thule

With less than a full year of the Fortus 450mc under its belt, Thule has already printed numerous designs. “We’ve saved over $45,000 so far this year, and countless days of time,” said Humphries. In a further nod to cost savings, engineers at Thule recently sought quotes to print large production fixtures out-of-house. “Costs were going to be about $18 a cubic inch to print out-of-house, versus material costs of just over $4 a cubic inch. “Based on this quoted cost, our volume of printing on our two Fortus machines has already saved us enough to pay for the two printers.”

Humphries is already looking to the next step in Thule’s business process and foresees 3D printing playing a large part. Thanks to Thule’s success with Nylon 12CF and the time and cost it saves, “I get to start looking at options for my next 3D printer,” Humphries said.

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