Thanks Drummerdude and Billb, I'm only a beginner in the 3D printing stuff.

I'm thinking of printing the trusrodcover again by printing it in two runs; first run is the cover itself, 2mm thick, printed in red (or black) and then leave the cover on the printboard. Next run will be printing the text and this text must be elevated 2mm (on the Z-axis) so that it will print directly on the cover.

For that I need to put down the exact location (the X- and Y-axis) of the cover and the text. If it is correctly set the print will be a red or black cover with reversed colored text.

Sounds like a nice experiment for a rainy day