After testing the first scraper I decided to make this slightly longer one.
I finally got this printed and it came out to be 230 mm long. It turns out that because it's very long it gets very thin towards the tip so it becomes a flexible scraper which still works. It bends if you bend it which should work fine for removing extra filament or other small things off the bed that can't be reached.

I suggest printing it on its side or you will get steps instead of a smooth angle. Make sure to add supports to the corners or use a brim to make sure it won't lift. I have started using a few supports to test out so I don't have to trim the full part all the way around.

I printed this without any support so it works too. I did find out that it's better to print one at a time. I put both long scrapers and one always seems to move and not work.