May one write or print Torah books in Kesav Ashuris?
Ashuris: One is not to print books in Kesav Ashuris.
Boxed letters: In previous times the custom was to avoid writing Sefarim in even boxed letters and they rather wrote them in Kesav Rashi. The custom however today is to allow printing books in boxed letters that are similar to Ashuris.
 Igros Kodesh 11/348; 7/305; Likkutei Sichos 24/375; Igros Kodesh 10/177 “Even the Rambams Yad Hachazaka was written in a slanted script in order not to resemble Kesav Ashuris.”
 Igros Kodesh 9/106; 12/228; 7/305
 Hisvadyos 1989 3/101; Igros Kodesh 10/177; It is for this purpose that Kesav Rashi was invented.
 Likkutei Sichos 24/375; Igros Kodesh 12/228; Hisvadyos 1989 3/101 “In the times of the Alter Rebbe the Tanya was printed in boxed letters”