The retraction at the end of print should be undone at the start of the next print:
However, I think the retraction of 20mm is too much. I have set my firmware to 12mm quite some time ago and had no problem with it; just the opposite, I printed over 1200 hours with the first (glass filled) teflon isolator and could have printed further.Edited by Guest
You may have to mush moisture in your filament, moisture makes it expand a lot and can cause these jams, also wait for the printer to fully cool before turning it off as the rear fan needs to cool the insulator down.
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