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Just a few hours after building my first 3D printer and running a test print, I stabbed my palm trying to trim some extraneous plastic from the model.
Oh the number of times I've burned myself during a nozzle change on my 3D printers, lol.
I just got a burn testing whether the nozzle was hot. I'd stupidly touched it and didn't feel anything so I touched it again and was rewarded by a 190C nozzle jamming into the space between my finger and finger nail and searing the skin.