Default Printer Margins?

[MariaAux]

I am creating a database to produce Teaching materials for the classroom (flashcards, Pictionary boards etc.) I notice that the default printer margins for me are;

0.28cm for top and left Margins

0.32cm for Bottom and Right Margins

I will produce this as a runtime version and the flashcards need to fit perfectly on all Printer margins for a number fo users.

Do all modern day printers have the same margins?

Is there a margin width I can leave that ensures that no matter which the user/printer, the flashcards will fit perfectly?

I would be interested to know what Printer Margins you have as default on your machines?

Thanks so much for all the wonderful advice, help and support.

María