Why did my print quality drop off after the first few prints?

Yeah, a drafty window can absolutely do that, expecially overnight when the room gets cold. I had my printer near a window for a couple months and the winter prints were noticeably rougher on the outside surfaces, plus more warp and pop-offs. Cold air blowing over the print causes uneven cooling, the layers shrink at diffrent rates, you get rough patches and corners lifting. Filament that stuck fine in warmer weather just lets go when the plate and room temp drop.

That spaghettai mess you described happened to me too, except mine was beacuse I touched the flat plate thing with my fingers after wiping it with a kitchen towel. Turns out skin grease makes prints let go. I wash mine now with dish soap and warm water, dry it without touching the top, and stuff sticks way better again. Also worth checking if your kid actually bumped it, because mine knocked mine once and the whole flat plate was slightly tilted without me noticing untill prints started failing. Do you wipe yours down between prints or just leave it?

Ten years of printing and I still go back to the old paper sheet method for leveling, dragged a sheet under the nozzle at each corner till it barely catches. Takes five minutes and it catches drift you would never spot by eye. A bump against the frame can shift things more than you would think.

For the cold room, before I could afford a proper enclosure I threw a big cardboard box over the machine with the lid flaps open for airflow. Ugly as sin but it held the warmth in and the warping mostly stopped. Also check nothing loosened up when it got knocked, bolts and the bed screws especially.

Following this one closely because mine did the same thing and I assumed I'd broken something. Mine lives on a shelf in the garage and I noticed the first prints of the evening always come out worse than the ones later on, wich made me think temp matters more than I realized. I ended up just moving it indoors and things got consistent again, but now I'm wondering, if I shift the printer even a little bit to clean under it, does that count as a bump? Do you all re-level after every time you move it or only when prints start looking off?