in lighroom classic it turns out to be possible to select a different printer in the "page setup" vs. the "printer settings". and strangely enough, this does allow printing.
but it can cause very unexpected errors, that are very difficult to track - in my case, i couldn't select the correct setting for the correct paper feed, because the two printers (Espon 3880 and R3000) have slightly different settings, which in most cases work fine but in some cases don't work. and all error messages only hint at wrong paper feed, but not at the fact that within lightroom two different printers are selected.
a simple solution to this would be a simple warning, that there are different printers selected in "page setup" and in "printer setup".