I'll throw in my two cents. I print exclusively in PLA. Aluminum bed. I put four strips of ordinary Duck brand white masking tape covering the bed, then a couple of layers of dollar store no-name glue stick which dries almost instantly. I run the bed at 55C and the extruder at 205C. Keep in mind that the thermistors on these units may be considerably out of spec -- I suspect the actual nozzle temp is a few degrees cooler than indicated at least, and the bed temp perhaps 10 degrees cooler. Works quite well for me.