If you are just looking for the liner production, an idea would be to see with a local printer who make die-cutting. Also you could do it with letterpress presses that are equiped for this technique, just need the punch. If it’s for standard envelopes, you will be able to reuse it as often as needed !—sorry for my english, I’m french 😉

I’m interesting to know if it’s easy to do it myself… I’ve seen lot of projects with these beautiful edge foiling but no ways to do it without using a hot foil machine like this one : https://www.youtube.com/watch?v=viPyAEAZOEsDoes anyone already tried ?___sorry for my english, I’m french… 😉