I’ve never done it personally, but I’ve seen videos (I think by CNCKitchen) which showed that, while it’s doable, the filament is not made to very fine thickness tolerances, for understandable reasons. As such the results can be, at various times, over extruded and under extruded.
If it was way cheaper maybe but it looks like it is more expensive.
If you look at the cheap trimmer from can tire (Yardworks 0.065 40 gm for $12) I can buy 450 gm of nylon for 29$
I can’t imaging trimmer line being worth spending more on.
I’ve also read that the density is not uniform either. That’ll mess with everything too
I say a print test. A lot of bubbles because of the high quantity of water in the product. A filament dryer might reduce or solve the issue. The person who did this just wanted to know if it could be done. The answer is yes, but not really worth the trouble.