International Journal of 3D printing Technologies and Digital Industry is an open-access journal, which means that all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in the International Journal of 3D printing Technologies and Digital Industry without asking prior permission from the publisher or the author. This is in accordance with the Budapest Open Access Initiative (BOAI) definition of open access. International Journal of 3D printing Technologies and Digital Industry aims to provide quality peer-reviewed, open access articles to thousands of researchers. The journals include papers on all the related areas of operations research, machine, computer, industry, electric and electronics, biomedical, mechatronics, and materials and manufacturing engineering.