Insomnia kicked in so here’s what I found about the extruder on the CR-10 v3; it’s an E3D Titan:
That one looks like a great extruder and I almost bought one for my Ender. However, I have never used one so take this with a grain of salt.
From what I could find, the CR-10 v3 appears to come with a PTFE lined hotend. If that’s the case, you need to clean out the thing, then unscrew the nozzle by about 3/4 of a turn, seat the PTFE tube all the way in, and then tighten the nozzle.
Or you could just get an all metal heatbreak and call it a day. I have a Copperhead in my E3, it works great.
And the forum decided to remind me of the DT product that I should’ve ordered…