For a project, I need to cut some foamboard. It's not a material I use a lot as I've never been happy with the edges I cut. I want square once, but always manage to hold the knife blade at an angle. With the thickness of the board, this looks a bit rubbish.
I know someone will say there is a proper tool for the job, but the only one I have is for 45-degree cuts, and I don't get on with it anyway.
Inspiration struck and I realised if I used a knife with snap-off blades, I could run it along the side of a bit of wood to keep it verticle. OK, the wood will eventually get carved away, but I only needed a few cuts.
For such a low-tech method, it actually worked very well. I don't suppose the cuts are perfect, but that are easily good enough for the job, and that's all I need.