Is it recommended to put oil (slight coating) on printbed?

It will always be a little stringy.
But nozzle temp and retraction are the two big things to play with.
-S

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I already played with the nozzle tempā€¦ some people say 230 is the best, but I am getting problems of flow at that temp.

Still need to play with retraction settings.

Am looking at this at the moment :

Did you print a temp tower?
There is no temp that is best for a certain type of filament. Varies from manufacturer and brand and even color within the same brand.

-S

No. But I printed a stringing test tower at various temperatures and found that my PETG-Red (provided by Snapmker) seems to work at 230-240 ( 235 being best )