Background
　　 The workers in the steel plant are often surrounded by various distractors. One of them is noise, which limits their work, especially because they cannot hear potential clues. According to a group of scientists from Germany, augmented reality technology that combines digital information with user environments may be the best way to solve this problem.
The data glasses were invented by Professor Rigo·Herold and his colleagues. While working at the Zwickau University of Applied Sciences, they developed a data Google that can improve the quality and safety of workers in many industries. As the product uses high technology, workers can obtain real-time information on operating procedures and warnings of dangerous situations that may occur in the work environment.
　　 Different from other data glasses on the market, each pair of 3D printed glasses can be adapted to a specific application. According to the requirements, the data glasses can be different in size measurement, temperature display or hazard warning. It can also be tailored for each worker.
Challenge
　　 Each pair of glasses should be suitable for a specific application, with temperature display, custom size measurement or hazard warning. He quickly realized that due to the unique characteristics of each type of data glasses, they could not be mass produced. Therefore, he decided to 3D print his innovative equipment.
　　 On the other hand, data glasses contain optical components, which require high precision for all mounted components. Therefore, conventional FDM printers, usually used for small batch production, cannot achieve the required accuracy. Scientists are looking for a technology that combines low production costs and satisfactory printing time with high-quality and durable print output.