I would like to have a new aura that make our characters permanently semi-invisible, like the stealth power after we attack, or the ancestor spirits of the Tsoo.
Sure you can 3d print characters.
The basic problem is that they are pretty blocky without the "magic" of render smoothing and all the surface textures.
So you can either get a very angular mini or you need to use some good sculpting / modeling skills to give them a good look.
But it is very possible.
https://www.cohtitan.com/forum/index.php?topic=13130.msg230137#msg230137
https://www.cohtitan.com/forum/index.php?topic=11982.msg214852#msg214852
And talking of sculpting
https://www.cohtitan.com/forum/index.php?topic=11522.0