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At least so far. The first go round had the nozzle crash into the tree support, resulting in a layer shift. The good news is that the print stayed very firmly stuck to the bed.
I've reset, lowered my extrusion multiplier a smidge, switched to a more traditional support pattern, and am going for it again. Wish me luck!
We aren't saying that the clothes are going to cause the printer to catch fire.
If the printer did catch fire, those clothes are going to make it a million times worse. You're correct when you say most of the printer is not flammable. If your printer caught fire normally, it might run out of fuel before the fire was able to spread anywhere else in your house. If there's the tiniest flame now, those sweaters are going to create a ball of inferno. It's the exact same reason why every space heater says not to dry clothes on them, 99% of the time nothing bad will happen but if something bad does happen that 1% you don't want to literally add fuel to the fire.
People are going to be fine with the "better looking" insulation because as you said insulation is made for this purpose and is usually fire retardant.
It's a dangerous setup man. No if ands or buts about it. I'll say the same thing again, I'm not here to tell you to change anything because mine is dangerous too, but if you're going to do stuff like that it's really important that you understand what you're doing (and why it's dangerous). I get that people online tend to try to find issues with everything, but sometimes people aren't just complaining because something "looks bad", and in communities like this it pays to look into stuff before assuming you know better than everyone trying to tell you the same thing.