Someone has asked me about how I print the images to fit on an inch coin (2,5 cm). I write it here in case someone else is interested.
You just have to copy the jpg file into a Word document and change the height to 18 cm.
¡Fits perfectly on it!
¡¡¡Thanks for all @Chakan516!!!
Thanks man! I´be just bought the coin holders ( the size 25mm because, i think, 30mm is sooo big ) I'll try different printing configurations to nailed it.
Thanks again ¡great job!