I guess China stuff is generally blacklisted...
Could think that the 4DBrix stuff may be ok (they are real, can be bought and are not as lego rival, rather then an addition): https://www.4dbrix.com/index.php
(there are even .stl files to download)
Could think that the 4DBrix stuff may be ok (they are real, can be bought and are not as lego rival, rather then an addition): https://www.4dbrix.com/index.php
(there are even .stl files to download)