would you consider this a sin?
copy of xyz brand name knife... not trying to trick the consumer at all.
I don't know if God will tell you directly, "Yes, this is ok," or "No, don't do this," but He might, so I would definitely pray about it first.
The moral issue for me would be, "Who is deserving the credit/profit from the design, and am I stealing from the original designers by selling copies, even if everyone knows they are copies?"
I know that nothing is new and most everything in some way is a copy of something else. But I actually struggle with this myself.
I love T-shirts with a variety of characters (Transformers, 80's cartoons, Super Mario Bros., etc.) but the best ones I find are always on internet stores in which artists are either blatantly stealing the designs or refashioning them from large companies without permission to make their own profits. I always ask myself, "As a Christian, should I buy them?"
The thing is, a lot of people don't mind if it's the little guy making a profit off a huge corporation that has enough money to legally defend itself.
But the problem is that now a lot of large corporations are copying designs from online creators, making them in mass production, and reeling in the profits -- when obviously, the individual creators don't have the means to fight back. (I watch some artist's channels on YouTube who openly talk about this problem when putting your designs online.)
So it becomes a matter of, "Who is allowed to copy whom, and when does it become a legal issue?" Is it somehow right if someone little is making money off someone bigger?
One thing you might want to ask yourself is, "If someone copied MY copy and made a profit off of it, how would I feel? Would I be ok with someone making money off of my own copy? And what do I believe God would say about it?"