mbaram

I just got my Ender 3 Pro a month ago as a hobby to start during quarantine. I decided to start printing face shields, but I wasn't able to get them to stick to the bed. Now I want to use painters tape but I don't know any good settings, and I have a few questions: 1) First of all, does it have to be 3m blue tape? 2) What's a good bed temp? 3) Should I put the tape on top of the magnetic bed? 4) I read somewhere that an Ender 3 should never go above 240c nozzle temperature—is that true? 5) And kind of an unrelated question: Are PETG fumes toxic? Some details: I'm using Inland natural PETG and I have an Ender 3 ProX