Everyone's printer is different. I use ESun PETG almost exclusively. I've found that 251° and sometimes 253° works best for me on my Powerspec 3D. BuildTak was just too sticky and any time I tried a fairly dainty part, I ended up breaking the part trying to get it off. With clean glass and 80° printing temp, as soon as the glass cools the part comes right off, no muss no fuss (no stick).