Attach bowden tube connector to the cold end, so that it's finger tight
Tighten bowden tube connector lightly with wrench, making sure not to over tighten. Over tightening will compress the insert and prevent proper extrusion. However under tightening will also cause problems because it will allow gaps where filament could ooze into.
Look through the bowden tube connector, and you should have a clean unobstructed path to the nozzle. See picture 2.
Filament should slide easily all the way through to the nozzle.
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