David Good 3D-Printed Bridge Competition 2025: All We Need to Know
At NJIT in Newark, New Jersey, on March 21, the 2025 David Good 3D-Printed Bridge Competition took place. Students and young engineers gather at this annual event to showcase their 3D printing and design abilities. It brings together high school teams and challenges them to build bridges out of PLA filament that are robust, lightweight, and creative. It would be beneficial for parents, educators, and students interested in science, technology, engineering, or mathematics to be aware of this challenge. Let's get down to brass tacks and find out what all the fuss was about at this year's event.
What Is the Competition All About, and Why Does It Matter?
Making a bridge is just the beginning. Understanding how actual engineers think is the primary focus. The mission is to design and construct a stunning, functional, and environmentally friendly bridge entirely made of 3D-printed components. Teams should also consider how fast they can assemble the bridge.
Participating in the tournament will force students to think like working adults. Design decisions, printing constraints, time management, and even public speaking are all things they need to think about. It's a well-rounded education that covers all the essential bases, encompassing key communication and engineering skills.
Who Can Join, and What Are the Rules to Enter?
All high school students are welcome to participate in the contest. Three or five students plus an instructor or advisor can represent each school on a single squad. The registration schedule is crystal clear. For the 2025 event, the deadline for submitting forms and fees was December 13, 2024.
The deadline for teams to submit their written proposals was January 24, 2025, following registration. The technical specifications, engineering strategy, and design concept were all part of this proposal. To familiarize themselves with the norms and expectations, teams were also required to attend virtual meetings in November and December.
All constructed items are required to adhere to the exact specifications laid out by NJIT. Next, we will discuss those.
How Big Should the Bridge Be, and What Are the Design Guidelines?
A bridge of precisely 20 inches in length was required of each team. The maximum length of the bridge, nevertheless, is 24 inches. The maximum allowable bridge width was 6 inches, and the maximum allowable height was 8 inches.
The bridge must have an open space underneath it so that vehicles (or cargoes, to use the true term) can cross it. As an additional requirement, teams had to create a bridge hole with a radius of at least 2 inches. In doing so, they ensured that pupils considered geometrical considerations and design limitations.
A compact shipping box was the only size that could accommodate the printing of all the components. As a result, groups had to get creative with their designs because pieces couldn't be any bigger.
What Materials Were Allowed, and What Could Get You Disqualified?
You could only use PLA filament that was 100% pure. There could be no addition of additional plastics or substances by the teams. The overall weight of the bridge couldn't exceed 1000 grams. There were severe penalties for teams whose goals exceeded. There was a penalty even for failing to have the necessary circular characteristic.
Glue and other adhesives were also not allowed on teams. A system of mechanical joints printed into the design was necessary for all parts to connect. Keep in mind that they were just interested in 3D printing and not in any post-processing or other materials.
Fines were levied if even a single component failed to match the dimensions or fit in the package. Ignoring these restrictions could result in a team's complete disqualification, as previously warned.
How Were the Bridges Tested on Competition Day?
Every team had to set up its bridge on a testing rig before the big day. An anchored saddle dangled from the center of the bridge, which rested on two piers. The bridge had to withstand the maximum load before collapsing, which the judges incrementally increased.
They also checked the rigidity of the bridges. The judges checked the bridge's bending moment when subjected to a 50-pound weight. Stiffness increased as bending decreased. A worse performance in that area was indicative of more bending.
The configuration was straightforward, yet it provided a good indication of the bridge's stability under load.
How Were the Bridges Scored, and What Were the Judges Looking For?
Five main criteria formed the basis of the evaluation system. The ratio of the bridge's weight to the maximum load it might support is the first consideration. Secondly, the degree to which the bridge was rigid when used. The total score was 60% in these two categories.
The next question was how fast the crew could assemble the bridge using the 3D-printed components. Quick and accurate assembly (i.e., no mistakes) earned teams additional points.
The team's presentation accounted for the latter portion of the score. In front of an evaluation panel, every group was required to describe its plan, decisions, and experiments. A more assured and articulate presentation could significantly improve the final grade.
The system was well-rounded and equitable, with prizes for not only physical prowess but also skill in design, communication, and speed.
What Smart Tips Helped Teams Do Well in the Competition?
Previous years' lessons taught several teams the importance of testing their designs before printing the finished bridge. Measuring is crucial because PLA can shrink or distort when printing. To check the fit and strength, teams would often print small parts first.
To delay failure, it was helpful to reinforce the area that was bearing the weight. Teams that took the effort to form their joints and leave room for assembly were able to complete their projects more quickly.
It was also unnecessary to go well beyond the specified weight. Adding strength to a bridge didn't make it better after it could support the maximum weight (140 kg). Skilled squads prioritized equilibrium over brute force.
What Were the Important Dates You Needed to Know for 2025?
It was critical to plan. In November and December of 2024, the competition year began with online interest sessions. Teams were able to learn the rules and get their queries answered during these sessions.
By December 13, all payments and final registrations were due. The deadline for design suggestions was January 24. On March 21, 2025, the NJIT Campus Center hosted the live competition. Presenting and testing could take place between 8 AM and 3 PM.
Who Won What, and What Were the Results?
Manalapan High School had one of the best squads this year. Both the presentation and design categories went to them. Their bridge's distinctive K-truss design was based on actual Japanese bridges. It took less than thirty-one seconds to put together, was sturdy, and had clear printing.
They supported more than 300 pounds with a bridge that weighed less than 2 pounds. A weight-to-efficiency ratio of more than 150 is impressive. In addition, the team delivered an excellent presentation in which they assuredly and clearly detailed all of the design decisions.
Best 3D Design Software for Education
Having reviewed the above, it's also important to examine the best 3D design software. There are many that are available, but we recommend using SelfCAD. With SelfCAD, anyone can get started with ease and they don't need to have previous experience to use this program. It also comes with numerous interactive tutorials that allow users to learn how the software works. The video below shows the overview of the software.
It's also affordable and there are downloadable and online versions that ensure that you work anywhere, anytime. There is also an in-built online slicer that you can use to slice your designs and generate the G-code to send to your 3D printer.
Why You Should Join or Support This Competition?
This event is perfect for those who are interested in engineering or design. As a teacher, it's a fantastic opportunity to provide your pupils with practical skills. If you're looking for a springboard, go no further than the David Good 3D-Printed Bridge Competition.
The course covers topics such as practical skills, problem-solving, teamwork, and presentation. There is no better moment to begin education than now, since 3D printing will play an increasingly important role in many future businesses.