The do-it-all filament: PETG! Learn what the differences are between Copolyester and PET and how to best print the materials. https://www.youtube.com/watch?v=8_adY2K-YIc
That’s next on my list to start printing. Thanks!
One issues I’ve always had with PETG is upward curl when printing overhangs.
Maybe it’s just the PETG spool I had, put printing PETG always felt like trying to print with a grease gun.
@Jason_McMullan Try it with less speed and more fan. And check your fan. Should blow more from the side as from above. Also try to turn your print so the fan can reach the most difficult parts of your print.
lost 2 glass plates, while printing directly on glass…
but shine finish is hard to resist 
@Fritz_We_1twa5ntm3 but additional cooling makes stick zone narrower on glass… on small footprint object need to be really squished to stick, so chances of glass failure goes up.
One of the most recommendations for glass and PETG is - don’t do it I never printed on glass. It’s kind of useless for me. If you have something with a shape of a cubish thing and you print that on glass - you have one shiny surface and five not so shiny. And if I read all the way thousands of different recommendation about printing on glass - use glue stick, must cleaned it with alcohol, use hairspray, bla, bla, bla - I’m fine with my not so shiny ground surface. Not perfect. But easy and without any trouble. 
Anyway… My recommendation works for me. So I gave this…
Do any of you MK3 owners have experience with printing PETG or ABS on that flexible steel print bed? I’ve been wondering if the force of the plastic trying to warp would pull it off the magnets.
The biggest problem that I have with PETG is the deposition of Antimony Trioxide on every part that surrounds the hot end: https://en.wikipedia.org/wiki/Polyethylene_terephthalate#Antimony
@ThantiK I’m seeing a ton of deposition in any hotend fan used for printing PETG, though I’m not sure it is actually Antimony Trioxide.
@Eric_Davies The magnets are extremely strong, you basically have to peel the steel sheet off the bed every time you remove it. Any print will release from the bed surface before it detaches the magnetic bed.