WAHHING 10PCS 2mm Thick Heater Block Cotton Safe Working Temp Less 300°C for 3D Printer Hotend

Being universal makes these an awesome product - I was able to trim them to the exact size I wanted and then secure them with 1/4" Kapton tape. I found them also easy to trim away from the holes I needed to be clear for the extruder.I cannot see why someone would give these a single star due to their inability to cut holes in the product - after all the product description does not identify a specific 3D printer - they are universal.

In the past, I have changed my heater block insolation a few times because of poorly fitting, leaking nozzles damaging it with molten, solidifying plastic absorbing into them. The insolation would become a solid, brittle brick of plastic and insolation. This is no fault to the insolation. It was a problem with low quality nozzles.The new insolation is great in itself. It lasts a long time (when not leaked on). It matches my Tina 2/Cadet 3d printer's original material exactly. It is difficult to fit and install, though, needing exact measurements factoring in the thickness, Kapton tape, and a large hole punch. Having insolation like this available has saved my 3d printer more than once! Well worth the money!

I bought these to insulate the new print heads  WINSINN MK10 Extruder Hotend Kit .4mm Copper Nozzle M7 Thread Heatbreak with PTFE Teflon - For Wanhao / FlashForge / Creator Etc.  for my FlashForge Creator Pro. So far I'm getting very fast heating times and no evidence of thermal radiation onto the work. Very easy to cut to make the holes for the heads and filament neck too. Be careful if working with bare hands and then touching your eyes or other sensitive areas though. The padding has a fiberglass-like quality. In fact I'm not sure if the "cotton" isn't just fiberglass since that would make more sense for an insulation material after all.

I ended up returning these as they do not have adhesive and did not come with any tape. I decided to buy another package that came with tape. If you've already got your own tape for these, they would work fine.

Came fast, exactly as I expected. You have to put your own holes in this and it doesn't include the tape. For the holes, I just used a hole punch and overlapped the punch outs a bit till the final hole was big enough.For the tape, smallest width of kapton tape I found was 2x too wide. I cut off a piece and put it onto parchment paper then I used a razor blade with a straight edge to slice down the center. Now I have two pieces and perfect width. Cut as many as you need in advance and put the roll away till later.Or buy the wide tape for the printer bed and cut thin pieces off of it in with same methods!Enjoy!

The fabric is nice, but there is no adhesive or anything that allows you to adhere this to your heater block which means you will need to buy kapton tape. I recommend putting a layer of Kapton on the cotton side so it doesn't stick to your heater block. It's weird but i put one on without a layer of kapton and the cotton started falling apart and stuck to my heater block. Also you have to cut the holes to fit around your feed tube and hot end, i recommend cutting the holes a tad bigger so they don't interfere or get caught in the nozzle if you ever have to replace it.

Sufficiently insulate-y and appealing color.Come on folks how the heck am I supposed to write a review for this?! It worked fine. Will buy again.

I used a digital soldering iron set to 250 C and it turned dark brown in 3 seconds. At 200C it slowly turned light brown. 480C it turned black and deformed away from the heat. I only tested it at 480 because it says it can go to 900C. Im worried that it will catch fire.update: this is a gimmick. maybe for some people this might help if they have a very weak hot end. The yellow film starts pealing off and gets stuck in the print.I should have returned this within the time limit.