3D printed arm braces for trauma and orthopedic treatment are becoming popular and gradually replacing traditional arm braces in orthopedic medicine. This product is receiving a lot of attention from businesses and researchers because of its advantages, such as: high personalization, light weight, aesthetics, easy to replace and remove, creating comfort. For patients, and can be combined with other devices to serve the treatment process. One of the requirements of the arm brace is that the material is biocompatible and universal. However, currently, arm brace products manufactured on open-source 3D printers still have limitations in durability and surface quality. The objective of the research is to survey and adjust technological parameters to manufacture arm brace products using Polyethylene Terephthalate Glycol (PETG) 3D printing filament, a suitable material due to its good layer adhesion, no smell, low shrinkage, and approval by the FDA. Research results have identified the optimal set of parameters to help reduce manufacturing time and improve product surface quality on specialized open-source equipment designed and manufactured by the research team.