I am using the Print Designer block on Firefox 52.7.0 on MacOS 10.10.5. I formatted a record to a custom size (270px width x 400 px height). I printed 12 such records (filtered) from my Airtable sheet on a letter-sized page. 6 records fit on a page, so it ended up being two pages.
On the print settings screen I selected portrait orientation and that I wanted cutting guides.
On my MacOS printer screen, I printed to PDF.
The PDF showed up as landscape orientation (not portrait), and the cutting guides showed up on the second page, but not on the first page.