Making perfection better…
Originally shared by Paweł Dobrowolski
PTFE bandage works fine. That is why I’ve developed PTFE hats.
What is this?
Custom made nozzle. This ptfe hat is added to isolate hot surface of nozzle from print. Moreover it doesn’t let lose temperature of melted filament.
Interesting concept, though the only problems I’ve had with excessive heat from the nozzle were due to contact. (PrintrBot nozzles are pretty flat-tipped)
I’ve noticed, that using this isolation, PLA was more adhesive and less curly especially when I was printing small details without FAN.
looks stylish! 
This might also be important for many tightly packed hottips, like in The Kraken.
It does, somewhat, ruin the concept of an all-metal hotend when you strap a chunk of PTFE to the hottest part, but I see how PLA could profit from reduced heat radiation.
It’d be less attractive to look at, but to reduce radiative heating, you could also just hang a few pieces of tin-foil from the hot-end’s carriage. As long as they aren’t in contact with the hot end (or ideally each other, much), you’ll get a substantial reduction in heat transfer from the hot end to the print. Poor man’s MLI.
@Thomas_Sanladerer I could see it ruining the concept of an all metal hotend if you weren’t to account for it. I personally wouldn’t mind a little PTFE shield for the nozzle tips that had its own suitable insulation (heat shield of some sort).
It depends what benefits you are looking to get from all metal hot end, I guess. Any benefits short of “really high temp printing” wouldn’t be affected by Teflon hats.
@Jasper_Janssen I also think that surface temperature could be lower than temperature inside heat block.
Out of curiosity couldn’t you use a ceramic, it would insulate and shouldn’t melt at high temps
PTFE is material which I can lathe without problems.
Yes, but if you used certain types of ceramic you could either mold them or pack it around the hot end and bake it.
Ceramic is good electrical isolator, not heat. That is why it is used at ceramic heaters. I don’t see any advantage of using such material in this application.
Either way, the point of the teflon is just as much that things don’t stick to it. I don’t know of a ceramic that exhibits these properties.