I'm noticing in v3 that printing a document uses more pages (13 pages vs 5 pages). My settings seem as near to identical as I can tell. I looked at the swiss.css in both Marked 2 and 3 and noticed some differences. In particular v3 sets font-size:16px and v2 font-size:14px and line-height is 1.6 vs 1.45. Also I see v3 uses rem and v2 uses em for sizes and some changes in li size and height.
I don't know if I changed swiss.css in Marked 2 to these values or that's how they were. Before I make changes myself, I was hoping to find out if these are deliberate or if I modified Marked 2 or any hints as to what else could be a cause.