Chinedum Okwudire, associate professor of mechanical engineering at the University of Michigan, developed a software algorithm called "FBS Vibration Compensation" that effectively increases 3D printing speed.
Although desktop 3D printing options are abundant in the FDM category, consumer-grade 3D printing does have its limitations. Speed ​​is undoubtedly one of them. Although desktop FDM 3D printers may print much faster today than they did a few years ago, there are still some compact desktop 3D printers that are limited in speed. Interestingly, not only the speed of the motor makes the desktop 3D printer fall behind its peers. Because although some desktop standard hardware can theoretically work at very high speeds, difficult factors such as vibration make these speeds impossible to implement in practice.
This is because consumer-grade 3D printers are manufactured using lightweight components, which have advantages in some areas, such as portability and cost, but that means they are not very resistant to vibrations caused by motion. This means that excessive 3D printing speeds can cause errors caused by vibrations around the printhead. The University of Michigan's Okwudire lab is working to solve this problem by developing a software compensation technique to predict and mitigate the vibrations that occur before the shock, effectively blocking the source.
FBS algorithm reduces surface ripple
This technique is known as "Filtered B-Spline (FBS) Vibration Compensation" and uses prior knowledge of the dynamics of 3D printers to mitigate vibration problems. This allows the machine to print faster without causing errors such as surface ripples. “Software compensation is not a new technology, but the challenge is how to use it in an efficient, powerful and versatile way,†explains Okwudire. While the FBS algorithm works effectively in experiments, Okwudire and his team believe that this may be a cost-effective means of achieving better print results from low-cost desktop 3D printers. Using software compensation is really a good thing, in a sense, it's free," Okwudire said, comparing smart technology with other options, such as investing in advanced physical components. A test conducted by the lab involves 3D prints the Capitol building model to test the difference with or without the FBS algorithm.
3D Print Capitol Building without (above) and (below) FBS algorithm
First, the model uses "conservative acceleration" and 60 mm / s speed to print without FBS - how to avoid vibration problems without having to access the damping algorithm. This means that 3 hours and 59 minutes of printing time is required. Next, the researchers tried to print the model, still 60 mm / sec, but the acceleration level was 10 times higher. They perform this printing with and without the FBS algorithm, each taking 2 hours and 6 minutes. Although FBS-assisted printing results are perfect, unsupported printing fails while moving at extreme levels. The researchers even found that they could push the acceleration up to 20 times without affecting print quality. However, early tests showed great hope for FBS technology, and researchers at the University of Michigan wanted to fully understand how vibration compensation works. They say that doing so will allow them to further reduce the vibrations caused by the movement and ultimately help them further improve the speed of 3D printing.
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