**3. 3D printing equipment (DMLS)**

It used 3D printing machine which is defined as EOS M290. This is the DMLS (Direct Metal Laser Sintering) skill to make a specimen. It has a property summarized in **Table 1**. It shows more detailed information for the equipment. Among


#### **Table 1.**

*Technical data of DMLS equipment.*

these, one of the most important factors is building volume and power supply for the laser. Maximum size of volume to make a model is 250 mm × 250 mm × 325 mm. To make a good quality model, volume size must be 200 mm × 200 mm × 300 mm at least. And laser type is Yb fiber laser with 40 Watt, scanning speed is up to 7.0 m/s, and power supply is 32 ampere with 400 Volt. In addition, more information for the equipment such as dimensions, weight, software, applying materials, etc., is described in the table, especially, materials that have been developing continuously. Now they can obtain materials like aluminum alloy, cobalt chrome, nickel alloy, stainless steel, and titanium alloy. These are based on powder type.

Technical data for aluminum alloy is shown in **Table 1** and **3D** printing machine, EOS M290, based on DMLS skill.
