I am attempting to print on custom (plain) paper size (3"x6") fed (with long side in direction of feed) from the manual feed slot and output at the back. I am able to print on #10 and monarch envelopes with the same feed/output. When I use the custom paper nothing appears on the paper. If paper is drawn from the lower tray printing occurs at the upper left side of the sheet.
I have tried this with Linux, Mac OX (catalina and el capitan), and Windows 10 with the same results. With Linux I have used cups command line specifying papersize, media, and orientation. The paper is fed nicely but that is half the job.
I would appreciate a hint about what might be wrong.