Warner Bros and other media company`s are updating their copyrights all day. Even if the cartoon rights have passed over 70 years in EUROPE the rights go over 70 years of the death of the author. Life+70.
So that means you are not entitled to use the characters, only after (if the author lives 70 years) 140 years total. The the copyright expires. And the works is Public Domain.
My legal advice is that better draw your own character and have full IP protection.
1942 + 140 = 2082 , so all characters Bugs Bunny etc are covered by COPYRIGHT! (just an example if the author lives 70 years , some live 90)
This si valid for Music, Designs made by Designers , Drawings , Sculptures , Paintings , Engineering Drawings that are not made to Patents , Interpretation of art for Actors /Singers /TV presenters/ etc.
Yep , I got a law degree.
The complete list is here
https://en.wikipedia.org/wiki/List_of_countries'_copyright_lengths
You will get sued by the Warner Bros and others if you use any character in that cartoon , and they can ask in damages if you sold lots of products based on any character that is presented on that cartoon.
And your models will be down due the Shapeways Terms of Agreement
https://www.shapeways.com/terms_and_conditions
check the part " You, as a designer, retain all your intellectual property rights in your 3D design, including without limitation any and derivative works like 3D renders. Except for the rights and licenses specified below, Shapeways shall not use, modify or display your 3D design or derivatives thereof. By uploading your 3D design, you warrant that it is your original creation and
not copied from any third party and/or entity"
I bolded the important part.