Dewa,
Eric is right. If you copy something for your own personal use, then it's sort of okay. It's a real gray area, but it's not an offense.
When you copy something and give it away, even if you only recover the cost of materials, it's technically a copyright breach as the recipient is gaining virtually the same product for next to nothing and the owner of the copyright is getting nothing. Prosecution could result.
How would you feel if the original artwork was yours (blood, sweat and tears), and someone was copying it and passing around copies of your work? Not too happy? Probably not.
I had many discusstions with the folks at the Britten Motorcycle Company in New Zealand. They make an incredible motorcycle (the Britten V-1000) and they also make an amazing lost wax cast pewter kit of their motorcycle. It's beautiful. I bought one of their 1/12 scale kits ($300 AUD - hell's bells!!!) and couldn't bring myself to damage the pristine kit by building it, but I had to have one in my collection. Dilemma!!
So I asked them if I could copy their model for myself.
The marketing manager at that time told me that as long as I made the copy for myself and would never sell, give away, or profit from the copy (including selling the assembled model) then he was happy for me to go ahead.
We just have to respect the property of others, really. Just use common sense.
Cheers,
LeeTree