Pretty certain it was this forum but could be mistaken.
A while ago 3 + years ? someone posted a few pictures of a Subaru engine they were building.
What they were doing was building a static model out of 1mm card and slicing the model up into layers which were then cut on a laser cutter.
I remember seeing a picture of a two block cylinder head all assembled out of card.
In fact it was one thing that turned the light bulb on for me as to what a laser cutter could do as regard stacked patterns.
I lost the link to the thread [ if it was on here ] and would like to save a copy of that picture. A quick web search has so far found nothing.
I am posting this on the HMEM group as well in case I have sites mixed up but will update both sites if I receive anything.