It is what it says it is, fits, etc etc.

the heater block is perfect! Very easy to clean

Just get this and you will be happy. It keeps the heat where it is supposed to be at the hotend. I strongly prefer this new design over the old one. The old one would occasionally snag on the model being printed causing problems. I have done dozens of prints with the new silicon sock and no snagging issues - and I don't expect any ever as the silicon is not so close to the tip of the nozzle.

Hotend comes up to temperature faster, and won't cool appreciably, even with the 2 cooling fans running at 100%. Bridges are a lot better. Easy installation. Fast shipping.

These docks fit nicely, but it is hard to get them to stay seated in place.

Item as described - great feature

Now I am using this on the heater block of a clone E3d v6, and I have to say it's a good fit. If any of you have the Zorvo clone bought off Amazon, this is the sock for you. I run massive cooling on my carriage. 2 40mm fan set up, each duct blowing on the left and right of the nozzle, now even with PID tuning, it is still capable of making the heater run overtime and drop a few degrees. No doubt if not PID tuned, you will most likely see a huge drop in temps. After installing this sock, I can gladly say that it does EXACTLY what it is meant to. Which is make the heater block a nice blue color. Actually to hold in the temp to keep the heater block at a constant temp via insulating. As well as to keep the hurricane force cooling system from stripping the heat off the heater. All in all, the more constant your temp control, the more consistent the extrusion, and less clogging. I'd say this is one of the BEAT $2.50 investments you can buy, even for a cheap $20 clone hot end. So go forth my friends, if you have an authentic v6 or a clone, gather up your candy money and grab 1 or 10 of these. It's a great investment that works :)

Title says it all. Two things have been very noticeable since putting this thing on: 1) Hotend temps with the part fan running have been more consistent and stable. 2) Not a single issue with PETG sticking to the nozzle, something that plagued me before. Needless to say I'll be picking up more of these just to make sure I'm never without.

as advertized, delivery is prompt, happy to do business

These are amazing. Not sure how I ever did without them. The heater block heats up much faster, keeps that heat in and from transferring to the print. You would be crazy not to try these.

It holds heat, most plastics do not stick to it. Perfect in every way. :)

It works just as well as the one that came with my lite6 hotend. Great isolation from any fans, and it's saved my hands several times when I need to reach into my Delta style printer. My only dispute is that it still slips off very gradually if it gets bumped, this can easily be fixed with a stiff wire around the top, or a high temperature rubber band. It stretches to make it easier to attach, but being a soft material, can slip down and get caught on a print once in a long while. Still, totally worth the few dollars on the side of an order. Especially worth the easily cleaned nozzle.

I bought some of these socks to keep my heater block and nozzles clean so i don't get any of that black gunk that appears when the filaments melt to the nozzle and it worked perfectly just the way i intended. however i bought them for my prusa i3 mk2 and i needed to partly take the hot end apart to put it on but no worries i love these silicone socs.

Fits snugly. Very good for keeping heat isolated and plastic off your nozzle. Does add a bit of bulk to the heat block though so pick out your fan ducts wisely.

Awesome product, easy to put on, It adjust to the hot end shape. My hot end is not the original E3D V6 hot end but the Chinese knock off and works great with it as well