I wrote mail to pdfforge and I got this answer:
"Thanks for the reminder! I was quite busy because we’re preparing a new release.
After some testing I found out that PDFCreator is technically capable of creating PDFs in a format like 5cmx70cm.
Follow this guide to setup a custom paper in the PDFCreator Printer: support.hp com/us-en/document/c03890386
If you choose the paper size in preferences and print a test page, PDFCreator will create your custom sized page. Printing a .pdf sized 5cm x 55cm to PDFCreator will result in a pdf with the size 5cm x 70cm.
I think it’s possible to make it work somehow but at the moment this will take some effort on your side.
You might also check if your Receipt printer(s) are capable of cutting the paper from a specific token. I’ve found the following answer in a quick research: stackoverflow com /a/35623048
However, I’ll gladly ask our devs to accept this as a feature request."