I've found some printed pizza boxes that are totally printed, also on the folds, but I can't understand if they was precedently die-cutted and then printed or viceversa. What do you think? I haven't any experience in printing on fold but I'm quite sure the ink will blur on them:
you just print them unfolded across all panels at once. superfine detail can be lost around the folds (or even just because of the unevenness of the corrugations) but if the artwork is prepared correctly it's not too big of an issue.
Mhmh It was what I wanted to do but the boxes come die cutted from another company and also if I order 100/200 of them I believe they don't lose time to die cut a very small number of cardboards. On more the shipping costs will raise a lot the single cost of the finished boxes..