Engineering polymers are a group of plastic materials that have improved mechanical and thermal properties that make them ideal for all types of engineering applications. Some of the Engineering polymers possess metal-like strength. Due to their high glass transition temperature, the processing was not easy, so there was a limit to the expansion of the application field. We focused room-temperature 3D printing using the engineering polymer by advanced technology so-called precipitation 3D printing. As a result, it was confirmed that successful fabrication of 3D structure based on Polysulfone or Polyamide-imide and  their high mechanical properties and thermal stability was also investicated.