Slice EngineeringCopperhead C-E Bimetallic Heat Break for Creality Ender 3 / Ender 5 / CR-10 / CR10 / CR10S Printers - Stop Clogging - Improve Resolution - Eliminate Heat Creep - Made in The USA

I decided to buy this heatbreak after reading up about requirements for printing ASA, but I am still a beginner and usually print with PLA. Installation was quite easy and I did use the boron nitride paste according to the Slice Engineering directions. When I first installed this, I went through the Teaching Tech calibration series of videos and tools. That led me to work with a retraction setting of 6mm which resulted in the least stringing. However, when I went to longer duration prints I got jams in the hotend leading to extruder grinding. It took me some time to determine that the likely cause was that pulling hot PLA high up into the heatbreak for traversals was very likely causing a clog. Upon switching to a lower retraction distance, I've been printing for several hours clog-free and am happy with this upgrade.

In my journey of upgrading my Ender 3 Pro to print faster, more accurately, and to support higher-temp materials, I came to the decision of do I get an aftermarket hot-end or do I upgrade the stock one? Considering the materials I use and the speeds I wanted, the relatively low cost of upgrading the heat-break on the stock Ender 3 Pro hot-end made the most sense. At the same time, I overhauled my hot-end with a a custom dual 5015 blower fan part cooling duct, bigger 4020 hot-end fan, Bondtech CHT 0.6mm nozzle, and Capricorn PTFE bowden tubing.Installation of this heat-break was fairly simple and straight forward. In my case, I have the top of the threads just barely sticking out of the stock heat block so that I can screw the nozzle in just a little more to potentially get a little more thermal conductivity. Putting the stock heatsink on top was as simple as applying some thermal paste to the two parts, sliding the heatsink on, threading the screws through the heat-block and into the bottom of the heatsink, and tightening the set screw on the heatsink so the heat-break doesn't try to rotate any. I did not get any of the boron nitride thermal paste Slice Engineering uses with the full Copperhead hot block kit and instead used some Thermal Grizzly Kryonaut since it is rated for as much as +350C and I had it on-hand.On my first print, I set my retraction distance to half of what I had it set to as per the recommendations (I also upgraded to the Capricorn PTFE bowden tubing and a Bondtech CHT 0.6mm nozzle when I installed this heat-break) and haven't had any issues with clogging or jamming during prints. I did some testing on the retraction distance and found no meaningful difference between 1.5-2.5mm so I left it at 2.0mm.After a few prints, I noticed that there was material leaking through the threads and getting all over the top and bottom of the hot-block. While I did have the nozzle tight to the heat-break, after a few cycles they worked themselves loose enough to leak. A quick tighten of the nozzle later and I haven't had any leaks since.When printing PLA, I typically run 65-120mm/s print speeds depending on the feature at 235C. For PETG, I run the same speeds with temps as high as 260C, but usually stick with 250C. It is great printing at temps above 235C without any fear of the factory PTFE tube degrading and releasing toxic fumes.The 4020 fan I put on the hot-end was already a lot quieter than the stock 4010 fan while moving a similar amount of air. After installing this heat-break, I noticed that it keeps heat out of the cold-side of the hot-end so well that I was able to reduce the hot-end fan speed to be slightly above ambient noise levels without any clogging or jamming issues.Great product, I can't recommend it enough!

Slice Engineering Copperhead Heat Break for ender 3 v2 and thermal paste for assembly. Received the parts quickly. Spent almost 2 hour cleaning everything up and installing new heat break and thermal paste. Recalibrated the Z offset did a few small test prints to verify Z offset. And printed a articulated dragon. It is a noticeable improvement. I increased my print speed 10% with improved print quality. The heat break was a little pricey, it is a direct replacement upgrade, and of very good quality. In my case the heat break was well worth the extra cost.My extruder, hotend and fan assemblies required no other modifications installing was very straightforward. I'm happy with the upgrade and would do to another printer. Thank you.

I really was looking forward to using the Copperhead but when it arrived it almost looked used. Scratched up and just a bit unusual for a new part. Almost as if a tool had previously been used to tighten and loosen it before. Regardless, I tried to install it and while hand tightening into my Ender 3 heat block the threads came off inside the heat block! The inner tube came out but now I have threads stuck in my heat block and a broken Copperhead. I’m really disappointed and will likely need to buy a new heat block.

Installation was a little tricky, mainly my fault but it seems to be working very well and has maybe improved my print quality! I also don’t have to constantly buy PTFE tubes anymore!Update: Dropped to 4 stars because it did not help with my heat creep problem. I even used thermal paste on the heat sink side.

Very easy to install