You got it right! Thanks for the quick reply.
Somehow I do have a bit struggle with printing the right size (30MM). Since we use different metric-systems and the translations is a bit off, its hard for me to decode.
1. In Paint.net I use CRTL+P to get the printer-settings.
2. Paperformat: Letter (8.5x11) | Quality: Normal | Papertype: HP Glossy
3. Printersettings (are exact like you said).
4. On the right of the Paint.net screen, you can choose different types of printing (for example: Full width Page, 13x18CM (2) etc.)
What option should I Choose (See attachment)? (Sorry for the dutch).
Thanks again - OMGthat1dude (¬ _¬ ")