A square pencil case was made. The dimensions of the box are 90x90x100mm. On the outer sides of this box, a regular pattern made of bulging equilateral triangles of different sizes, as well as slits in the form of smaller equilateral triangles, was made. All edges are rounded to protect the user from injury on sharp edges. The model was made in SolidWorks and exported as an STL file. This box is intended to be made on a Bambu Lab P1S 3D printer with a 0.4mm nozzle.