Some size comparisons of the E3D v5 and E3D v6 hot ends before I swap mine out. I am impressed with the difference in size. Hence the photos 
Why’d you upgrade? To gain added clearance? What’re you doing with the old one?
Honestly, because I can. It may sound vain, but half the fun for me is trying new things. The old v5(s) will end up in my friends printer (they currently use jhead v4)
Mine was shipped 14 days ago, but I have not received it yet. Hope it´s not lost in the mail. usually take 3-4 days for UK to Norway.
I was asking because I have a jhead and was interested 
Anyone know the weight difference between them?
@Matthew_Satterlee the metal parts are about 10g lighter than the v5 and about 7.5mm shorter.
Thanks @Thomas_Sanladerer !.. I’m trying to decide if I should get the v5 on sale or spend a little more on the v6.
@Matthew_Satterlee i’d get the v6, even if it was just for the clamped thermistor. But you also get the new heat break, the molded fan shroud, the new Kraken-style bowden coupler and 7.5mm of print height with the v6, so i think it’s a pretty easy choice. Not that the v5 was a bad hotend, but the v6 is just plain better.
@Shauki E3D have published all drawings at http://e3d-online.com/documentation . The hotends are licensed under a CC non-commercial licence.
The heat sink is a turned aluminum, made with something like a parting tool - if you’re careful, you should be able to make a functionally identical one on any lathe. Some hotends also use modified off the shelf heatsinks or machined t-slot aluminum (Deezmaker).
But the trick really is the heat break / insulation, using a piece of stainless steel turned down to a small cross-sectional area keeps heat from creeping up in the first place. The E3D uses a 40W heater, but only uses a small fraction of that power once it’s heated up.
Here’s a link to the documentation @Shauki.
http://e3d-online.com/E3D-v6-Documentation
They didn’t give any details about room temperature in which hotend should work.
@Pawel_Dobrowolski the cooler only gets a couple degrees above room temperature, so it depends entirely on your filament if it’s going to print well. I’ve personally printed ABS with an E3D in a ~50C heated chamber, which worked flawlessly.
@Thomas_Sanladerer are you taking about v6 or v5?Because with v5 I have no doubts.
@Pawel_Dobrowolski their cooling performance is actually quite comparable.
@Shauki true, that’s why i’m mostly printing ABS! I have some of the cool new materials and am currently working on figuring them out. I’ll be making video guides when i’m confident with them!
@Thomas_Sanladerer I can’t say because I didn’t see any performance temperature MES with measurements. Color graphs are good for slide show…