I have always liked the little Minecraft papercraft figures that you can buy at the store. You punch out the figures from the sheet and then fold up along the fold creases.
Recently I saw some party boxes that used the same technique of pre-imprinted folds, as the paper was thick and trying to make the fold from scratch would be a pain.
In trying to replicate this technique for a design of mine, I got a cut tool that I can roll around the sides of the outline to be assembled that cuts most of the construction paper, leaving a bit behind to hold it in. The pieces punch out without too much difficulty.
However, I still can’t get my head around how they get those perfect guide indentations for folds. Is there a tool that I can use which puts folds into flat paper so that folding up the design is as painless?