Can't save stl in other folder/path

[xabixab]

Hi!

Is not posible to save an stl in other folder.

https://github.com/taxpon/pymesh/blob/a90b3b2ed1408d793f3b5208dd8087b08fb7c92e/pymesh/base.py#L222

That line extracts the filename from the path, maybe hardcoding filename = path works well...

Regards,

Xabier