Easiest route is probably to use GrafX2 to convert them to PNG or another common modern format and then print them however you like.
Another option would be to use PPaint or ADPro on the Amiga to convert them. You could also paste them into PageStream and save the page as a PDF.
You could also use the Amiga's PostScript printer driver (OS2.1+? Maybe only 3.1+), print to file, then copy the raw PS file to another machine and work with it in Ghostscript or Acrobat where you could print it using any printer.
Circuitous, yes, but doesn't require tracking down an ancient printer and compatible ink.
TurboPrint is still available, which has support for slightly more recent printers. A list is
here. Also look for a copy of Studio II Professional, or CanonDisk on Aminet.