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When you order bowden tube it comes with a cutter. Make sure your fittings are tight.
But also heat up the hotend remove the nozzle and tube. Then push in through a piece of old bowden tube. This ensures there is no remaking plastic in the throat. Now reassemble. the old ptfe tu
If it’s the standard hotend the tube touches the nozzle. It shouldn’t really be consumable but if you are printing at higher temps (i.e. over 220C or so) it can melt. If you are printing at those temps it’s worth swapping out for an all metal hotend.
It’s also really important to make sure the PTFE tube is cut really, really straight and even where it interfaces with the nozzle. I’m not sure if Enders come with a cutter but you can look up a Ptfe cutter online.
One more bit of advise is to use a high quality tubing like Capricorn PTFE since cheaper stuff can melt at lower temps.
Yeah I've been printing a little PETG at about 240, but it's something I rarely do so I haven't opted for a all metal hotend and as I understood it I thought it was okay until about 250 C, but I guess not. It's really mostly PLA that I print though.
I'll look for a PTFE cutter, thanks!