I’ve tried searching this on YouTube to no avail.
Basically I want to make a postcard like this:
…using a “normal” postcard and some tool.
I’ve initially thought about a standard hole puncher, but it only makes 1 hole at a time (there are 80 holes in the postcard above), and thus requires a lot of time overall because correct positioning relative to the other holes needs to be achieved somehow.
Is there a better method?