<p>Why does the Ender 3 only have 3 limit switches instead of 6?</p>
<p>How does it handle crashes on other sides?
Is it worth adding them with a new mainboard?</p>

While better fitted to our friends at
law.SE
, the general gist is:
No.
Art is protected by copyright, and any adaption (
derivative work
) requires the OK from the right holders
per se
. Only 70-75 years after the death of the author (or publication for company works), a work enters the
public domain
and the copyright expires.
There are some exceptions (
fair use/fair dealing/
...), but
media transformation
is not one of them.
Giraud died in 2012, his estate or heirs - or whoever he/they sold the commercial rights to - own the right to ok derivative Works till around 2087.