Here’s a part of a cabinet in my wardrobe where my printer lives. It’s a bit noisy with all those hard surfaces so I am just about to put up some foam padding on all 5 sides.
Is that stupidly dangerous?
You can see I have a smoke alarm there, but it won’t stop a fire on its own.
Edit: the cabinet has no door, it’s always open like in the photo, but the wardrobe door is generally closed. The room has some ventilation so smells do go away.
Look into rockwool instead of foam - it does a great Job and is not flammable.
That would just get insulation all over every print they do though. You need something more solid.
or maybe DIY air-crete panels, not as great for the temps rockwool can tolerate but OP is plastic printing, not iron forging.