Sometimes you may need all the building plate space you can get. Or you have build your own G10 / FR4 plate, and found out you just misaligned the top surface, making it impossible to print the rear purge lines... (Oops 😳)
Here's how to fix that...
I made these tools to fabricate some of my own plates. These 'tools' are made using wood, some PETG bits and pieces, and a router. These made it a little easier to assemble a plate (but there's still a lot of room for improvements).
3240 can be anything. And stuff sold as FR4 can be outright crap.
So, there's the enterprising Chinese entrepreneur who sells very old FR4 on Amazon... It may once have qualified as FR4, but not today. These plates were old, ugly, damaged, full of scratches, and definitely contain formaldehyde, bromide, and probably tons of other halogens.
Moral of the story: made sure you know what and where you buy!
I can't imagine you haven't seen it, but if you did not then go and watch Person of Interest. This is the counterpart to last month's wallpaper.