Finally I got my CoreXY an universal spool holder :-) And I bought Simplify3d,

Finally I got my CoreXY an universal spool holder :slight_smile: And I bought Simplify3d, what a nice tool! It helped me to tame PETG. The printer is currently printing at 90mm/sec, travel moves at 200mm/sec, x/y jer set to 45, accelleration at 4000 in Marlin. I first had problems with stringing, but increasing jerk, accel. and travl speed helps alot.