It is still necessary to print documents. Many printers are able to print one side of the sheets, here I describe the procedure to print both side correctly. The procedure depends on the kind of printer.

Being PPPP the printed face, and WWWW the blank face it is the case 1 if printing a three pages document the sheets end up like this:

  PPPP
3 WWWW

  PPPP
2 WWWW

  PPPP
1 WWWW

In other words, the printed pages face up and the order of the sheets is reversed.

Ensure the input file has a even number of pages adding a blank page at the end if needed.

Split the file in even and odd pages.

Reverse the order of the even and odd pages file.

Print the reversed even, and the reversed odd file.