2pcs Smooth Heatbreak Upgrade All Metal Titanium and Copper Bimetal Throat Nozzle for Ender 3 V2 Ender 3 Pro CR10 3D Printer Hotend

This is review for heartbreak with 2 mm bore. The one with 4 mm bore not make sense to use, there is almost no advantages over stock.I have doubts about whether there is titanium or stainless steel at the bottom but that does not matter. The important part is a copper block on the top which should improve heat conductivity to the whole cold zone. Machining quality is good with the top diameter at 7.00 mm (to 10 microns or better) and the neck is narrow at 2.70 mm - this is as low as you could go. Fits well Ender 3 Pro and Titan Aero clone I have.Bonding between two metals might not be very good but one should not expect to put any torque on the heat break - just the nozzle and hot block so we should be good there.Works better than all metal stainless steel, and that's what counts.

looks to be quality, have used it on ABS and haven't had a clog

This is 2 weeks of use

I have been trying to print nylon with an all metal micro swiss knock-off. I've only been able to successfully print a few small gears.Anything bigger and the nozzle invariably clogs due to heat creep. I came across this product and thought I would give it a try. I installed it back into the original hotend on my ender3 and used a bit of thermal paste for good measure.I can report that it is now working way better than the previous all metal hotend ever did, and I have finally been able to print a part that would previously cause a clog every time. If you're having issues printing at higher temps, it's definitely worth giving these a try; they're a bargain.Love it!