Hi Rommo for your boolean problem as others mentioned above please post your .3dm model file.

Also as mentioned above the Transform > Array tools can be used to make repeating patterns.

For the kind of pattern in your link with every other row shifted you could use Transform > Array > Array Grid in 2 passes, like this:













You can make other kinds of repeating patterns by applying Array Dir in 2 different directions, see here for an example:

http://moi3d.com/forum/index.php?webtag=MOI&msg=2612.2

- Michael

Thank you very much everyone for the help. I'm away now when I'll be home in 2 weeks I'll post the object!