Thanks for the correction, I wrote that post off the top of my head. I definitely meant the X1, that's the printer I had in mind.
And anyway, if you're printing PLA you shouldn't do it in a completely closed enclosure, the temperature would be too high (or so I've read). Even the Sermoon V1 has cutouts for a small vent at the back. Even the Vorons aren't fully enclosed, although there's the Box-Zero[1] addon that does fully enclose the printer.
1: https://github.com/zruncho3d/BoxZero