Crop Marks In 100 Percent Black
Please add the capability to produce crop marks in 100 percent black. In the 2019 printing industry, not having this feature accessible is mind boggling. While there may always be a need for offset printing along with crop marks in registration builds, to ignore the needs of the growing digital printing market is a grave oversight on Adobe's part. Print shops are losing enormous amounts of money in click rates by not being able to produce a true black and white side with crop marks. This especially affects four color over black printing.
From 2013 to 2018, the digital printing market grew from $131 Billion to $187 Billion.  Adobe software is the print industry standard and to my knowledge, there is no feasible excuse for designers and press technicians to be using awkward and clunky workarounds to produce a simple thing like 100% black crop marks. With open source software becoming more accessible, you'd think Adobe would want to keep their programs relevant and up to date with the needs of the industry. This is a known issue, has been mentioned numerous times in feedback and on forums, it is an issue known to digital press sales people and service techs and nobody has come up with a solution?
Heidi Rosendall commented
My black text pages must be on one color plate. But when I export normally, the marks and bleeds, etc. come out as rich black, making the file have 4 color plates, which is not affordable for us. Our work around sends us to print to pdf (instead of export). Here, we still have 4 plates (ONLY BECAUSE OF THE CROP MARKS) so we convert to dot gain 15%, text as black. The text stays 100% black, but we lose 100% black for all non-text black, it gets the dot gain 15% (even though it was 100% black before the conversion). Why can't we have a simple export that is PDF/X compliant with one black color plate PLEASE. Other export choices like Black/White that sometimes appear cannot be used because they make the logos and maps have solid black instead of a grey. In case you were wondering.
Jasa Schmidt commented
This is just pure laziness on their part!
I find it odd the crop marks are forced to registration colour even when you have a 100% black / process black document. I am having to run a B&W fixer in Acrobat every time to get rid of the unwanted crop mark separations.
I think this could be easily fixed by adding one more colour mode to the 'Document Color Mode': Black :) Or Monochrome ;)