Dear Michael i've got already the usefull tutorial from Mike K4ICY: (http://moi3d.com/forum/index.php?webtag=MOI&msg=4388.107)
That's perfect for a push-button or a cuscion...but when you have a greater surface whit more than one little holes like this? I've been trying several times...i don't know how to build the net. (I lack experience).
So, when you've got time please give me a tip.