If you have A3 printer, print samples on A3 format. Otherwise print on A4 and use glue to connect top and bottom page parts. Don't use "Fit to page" option while printing!
Check that printed sheet sizes are correct (by a ruler or line). If there is deviation, try to fix it by using "Scale" option in print dialog.
Cut off borders according dash line.
Fasten by a stapler bottom side of your sheets.