The IOF Map Commission has created a test sheet, which has been printed using spot colour offset printing. The test sheet is free and can be ordered from the IOF Office.
With the test sheet it is possible to examine print quality using the following files:
The Map Commission is very interested in information on new printers and printing technology. If you would like to contribute, the following form can be used: Technical report (PDF)
Some more information (a bit outdated) can be found on: http://lazarus.elte.hu/mc/print-tech/index.html