

Nail polish typically uses acetone as its solvent, and despite smelling, acetone is something that humans naturally have low levels of in their blood, so slightly higher levels are pretty safe. Obviously, having exposure to large quantities is bad, but that isn’t how nail polish is typically used.
I’ve got an SV08. It’s not a perfect printer, but making a printer without the problems it has (e.g. the bed takes nearly an hour to settle after it’s reached temperature, so it needs a long preheat for all but the shortest prints) would require making it much more expensive (e.g. a thick aluminium or graphite bed that wouldn’t warp would add another 20% of the cost of the printer). That specific problem is sidestepped with the MK4S by simply having a much smaller build volume rather than because it’s higher-end and more expensive. I’ve not needed support from Sovol (yet?), so can’t comment on whether they’re still super slow like they supposedly were right after the SV08 launched.