We 3D printed two metal parts with internal cooling channels. The channel size is 0.6 and 0.8 mm. The cooling channel passes spirally through the part's wall, makes 4.5 turns, and exits at the center of the part. 3D printing material - stainless steel powder for metal 3D printing PR-07H18N12M2 produced by Polema JSC. The powder fraction is 25-40 microns. The layer thickness is 50 microns.

As a result of 3D printing with metal, both channels can be blown through. Despite the fact that the channels are almost horizontal, the correct selection of the powder melting parameters during the printing process allows you to print such channels without using support structures. In this particular case, the channel has a round shape. To improve the quality of the upper wall of the channels when using metal 3D printing, we recommend using a teardrop shape.