I don’t know. I’ve use this method several times and I’ve never had a problem. I probably should have specified that I’m in the states so 450° f versus 200 or 210° c that your printer runs at isn’t a huge difference. Sure. You run the risk of some fumes, but your printer is already belting the plastic. In that temperature. You need to go a lot hotter than 400° in order to set it on fire. It’s a lot safer than using a blowtorch