The background of the page, consisting of rhombuses divided in half, is an isometric grid. Such an A4 sheet template can be downloaded from this page of our website in order to print it later.
A4 template with isometric grid
To print a good quality isometric grid on A4, you will need to download this PNG file. The grid is made in blue, which does not interfere with printing it in light gray on a black and white printer.