Some may have seen my recent thread with heatbreak issues. I hacked together a solution that worked a little while using a china made 'ed3v6 1.75mm heatbreak'. This was a temporary solution until I could convince one of the Aussie suppliers to sell me a single heatbreak (they get pissy if you're not buying a whole hot end or printer). With that said I've put a good comparison together so others can see why you shouldn't buy the cheaper china option. In the following photos china is on the left and original is on the right. Massive differences are external thread length, internal ptfe capture length & machining quality. I suspect the metals are different but its hard to tell.