I mentioned previously that it might be 3DE PLA, but it could also be galaxy black PLA from Prusa. I think that is the most likely, it has a very faint sparkle in it.
The heat mainly comes out of the top, so far it has not been a problem. But all the concerns have made me want to print a new revision in a more durable filament.
Thank you for the compliment, I really like it too.