According to the comments,”PETG for strength and durability, polyethylene terephthalate (think plastic bottles) and the G means it’s been glycol modified for extra durability. PLA for speed and a little extra quality. It’s good stuff. PEI is an ideal print surface for PETG it adheres well but doesn’t fuse like it does to glass. The advantage of PETG is minimal warping, so you don’t need a heated chamber and virtually no smell with PETG”.:)
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