I have to admit, as many people before me, I was always printing at the upper end on the temperature range from my filament. I did this because it sticks better, I add the impression it was printer easier and better…
I have found on the internet ( isn‘t that thing great ? 🙂 ) the great following tutorial and especially the hot end temperature calibration. I was skeptical at first as I though I was pretty good with my settings but I was struggling with oozing and retraction with PETG, so I decided to give it a try.
The procedure is fairly simple. I took the 20 mm cube. Import it into your favorite slicer software and increase the size to 500% ( 100 mm ). For the printing test, just 2 external perimeter, no bottom or top surface and 20% infill. It will generate a cube with only infill, really useful for the test. With 100 mm size it should be big enough to you can see the part or infill during the print. If not increase the size.
After that just follow the procedure. Print the part at your normal temperature and reduce progressively the temperature. When you get little dots, increase by 10°C again. Simple !
Funny enough, my PETG is given for a temperature from 220 ° C to 240 °C for best results. The hot end temperature test gave me 215 °C. I have now setup my printing temperature to 220 °C and 230 °C for the first layers. This is around 20° lower that I use to.
After a few prints, I notice that the print quality improved, less problems with retractions, blob or anything like things, even the oozing got really better. I have almost reduce by half my retraction ( I have pressure advance setup ).
It is definitely worth doing this for every filament you get, it will give you better results and less headache!
Now that you have the right temperature, we can go on to setup the extruder and get the pressure advance and retraction setup !