1) Earlier while still using 'hamm' I wrote my ps.filter by using the documentation provided by Lyx customization doc. I used an old matrix printer to print ps- and text-files. It worked quite well.
2) When switching to slink I purchased a cheap Epson Stylus color 400 and installed 'magicfilter'. As being new to 'magicfilter' it took some time to find out that I have to run 'magicfilterconfig' to get it working at all. Now I managed to get the printer printing text-files perfectly just by selecting the right device while configuring. What about printing ps-files and other kind of files? Should I write myself ps-filter or how is done with 'magicfilter'? (The man page isn't very clear and in the docs there is almost nothing about it.) -hv