@@hubacekivan You have to have a perfectly flat surface. Use a dual line splitter if you need to. It's what I always use. You can get one thru Yellotools. Dual Bodyguard Knife. Line the print up, press it in place at the center where you split the backing, and let it rip. This WILL NOT work on an uneven surface.
What type of board is? Could you please share the link to get it. I am starting to like all this and I’d like to be as good as you. Thank you. I am a new subscriber.