My Ender 3 has a standard MK8/9 heater block. The item I received has the MK10 right on the sleeve. If you have an MK10 extruder block I'm sure they'll work fine, but they don't tell you the size very well. You can see how much free space has appeared. As soon as the sock starts to heat up, it immediately relaxes. You cannot return them. Please make sure you know your size before purchasing. Also, I didn't receive a sticker. I would be less annoyed if the part would fit.
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