If you want to foam core a game, there is nothing more important than the proper tools. Without, you will not get good results. I still get some bad cuts due to a dull blade, and have since gotten a much better knife and blades and it has resulted in great looking edges.
foam coaring
Foam Coring a Board Game
I began a new hobby, foam coring. I needed something that was different than my usual screen staring, movie and TV watching self. Something that would challenge me, utilize my OCD and extreme attention to detail and perfectionism, something that would frustrate me in a different way, and something that would pay off in the long run. I chose foam coring for all those reasons, and of course, because I love board games and want them to be kept nice for a long time, as well as make them easier to setup and start playing.