How to work with PETG? Settings, caveats, etc We've been doing some printing with PETG filament on Ender 3 Pro printer and the result were awful:


Here are settings we used:


Extruder: 240&nbsp;&deg;C
Bed: ~70&nbsp;&deg;C (&plusmn; 10&nbsp;&deg;C)
Speed: 80&nbsp;mm/sec


There are a few types of problems that we had:


Initially filament did not stick to the bed - those 3 items in the middle of the picture are example of this issue. This got fixed by increasing temperature of bed to 80&nbsp;&deg;C.
At some point a piece would get dis-attached from the bed and would move around together with the extruder around - two prints in the upper right corner of the picture were cancelled for this reason.
Models are very rough, like a cheaply made snowball - that tiny model in the upper left is suppose to be a cattle-bell. Could you tell?


Additional info

Filament that we used indicated


extruder temperature 230-240&nbsp;&deg;C
printing speed 40-90&nbsp;mm/sec
no info about bed temperature 


Question(s):


What are some optimal, tried and tested options for printing PETG? (Temperatures, speed, etc)
What are some caveats/difficulties of working with PETG to look out for? (For example, I've read that PETG likes slower speeds. Is that true?)
Is it possible that the model of 3D printer does not work well with this type of filament? (I don't have much experience printing so I can't know)
Slow down! 

80 mm/s is much too fast for PETG. Try 45 or 50 mm/s instead, even for infill, supports, and other less-visible areas.