I've posted before that I was unable to print from Panther 10.3.2 and barely able to print from 10.3.3
This has nothing to do with Calamus - Calamus prints as well or as badly as any other program - This is a problem with Panther.
Drivers for printers that are native to Panther seem to have no problems - It's the printers that are older and where the users must use GIMP print, that arean't working at all, or not too well.
The people who put out GIMP have come up with a fix - GIMP now prints faster then native drivers and it's quite stable.
This fix, the UsbTB, is an add on to the existing line of GIMP printers. In other words you still use the GIMP Print driver and simply add this on.
In my case, this was especially important, my Epson 3000 was more or less useless to me in OS 10.3xx - It now works perfectly. Even those who printers worked ok under GIMP will notice a defintie speed increase.