I bought this to replace a silicone case that I ripped while replacing the nozzle on my Ender 3. I wanted to replace them asap to make sure the heater block wouldn't deform the bullseye cooling channel I installed. to my print head. The air duct was printed in ABS but I was still concerned about warping. But I didn't really feel like I needed four of these, so I was hesitant to order some at first. When I received and fitted the new sleeve, I immediately noticed how much tighter and much more secure it was than my old sleeve. . I also really appreciate that the sleeve extends a few millimeters along the nozzle. This results in far fewer filaments getting stuck in the nozzle/heater assembly, which usually results in a burned out filament ending up on your print later. I haven't had this problem with these new sleeves. I appreciated the improvement in the sleeve over the nozzle so much that I even replaced it on my Ender 5 even though it was in perfect condition. While this is a seemingly minor improvement, it really made the product work for me. I am very happy with my purchase and will order again without hesitation. Thanks very much!
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