This model is actually prepared for 3D printing. I tried to print it more than 8 times for perfect properties and this 90 ° angle seems to be good. Try it and enjoy it :-)
STL (Stereolithography, filesize: 570 KB), OBJ (OBJ, filesize: 445 KB), F3D (Autodesk Fusion 360, filesize: 1.88 MB)