1.1   foamboard [60x40cm/2mm]
1.2   cutting mat [60x43cm]
1.3 cutting ruler [metal]
1.4   cutter knife [good one] ✂
1.5   adhesive spray [3M spray mount_blue] ☠
1.6   latex/nitrile gloves
1.7   paper 80g
1.8   color printer

2.1   print A4 [100%]
2.2   use adhesive spray to mount the prints on the foamboard [use gloves]
2.2.1   mount the prints on one side
2.2.2   mount the prints on the other / back side
2.3   cut with the cutter knife on the cutting mat with a cutting ruler [be precise!]
2.3.1   first cut the long side [not till the end!] .then cut the short side [full!] [be precise!]