CrealityOfficial K1/K1 Max/K1C Upgrade Ceramic Heating Block Hotend Kit, Unicorn Quick Swap Nozzle Kit, High Temperature Resistant, All-Metal Integrated Design Kit for K1 Series 3D Printers

Fit perfectly on my machine. Very easy to install. Runs well in the printer.

EASY Replacemtn, took about 45min to tear down and replace the old 2 part nozzle with this one, and after calibration works great out of the box.Only question I haver is this new nozzle is supposed to be a hi flow nozzle, so do we need new Parameters for this nozzle as compared to the old one, I cannot find any literature on this.

I had a really nasty jam up on my K1 (Old/Original Extruder). I ended up replacing this and the extruder. It was a 100% success and works better than it ever did!

I bought this to print Polly Carbonate and it does that well. I have also printed over 100 hours of PLA and PETG with it and does everything like a champ.

I got mine this morning, immediately I found two problems during installation:1. one of the small screws holding the nozzle to the hotend falling off right out of the box. The screw thread seems not the right size - it does not screw in. So mine is hanging by only one scew now.2. the wrench comes with it has about 4 sizes in one wrench. However, none of them fits the bigger hotend which you is required to screw/unscrew the nozzle.I have quite a few Creality products - four printers (TWO Ender 3 V2, ONE Ender 3 S1 Pro, and ONE K1C). The K1C comes without the wrench I mentioned above - missing it caused a damaged hotend so I had to purchase this one. But again, this one is missing the wrench that I desperately needed. I feel Creality's quality control of these small things degrades over the years, but these small things cause big damage down the road like what happened to me. I'm considering to switch to another brand.

The hotend worked perfectly, printing Nylon CF and other materials perfectly. I did have a problem with my hotend, the hotend broke off the cooling end (what it screws into). Mine broke during normal printing. However, I was given a replacement after reporting my issue and look forward to trying again. I was told to keep an eye on the screws, check them from time to time to confirm they are tight. I'll report back but just make sure that you keep an eye on the screws if you get one to ensure it continues to run tip-top!

I upgraded my gen 3 K1 and it works well. Not that the OEM hot end was bad. I actually liked it. The hardened nozzle and ease of replacement is nice. I didn't notice any extra flow, but it was plug and play - no profile adjustment.As for the plug and play, I had a heck of a time getting the old thermistor and heater power connectors off the board. I actually broke off the plastic pieces, but with some careful attention figure out I could plug them in regardless. I understand why they use the hot glue, but man I sure wish they didn't.I deducted one star because of the plug situation and the fact I didn't see an improvement in my prints. That being said I think it was a wise move. If you're on the fence go ahead. You'll be happy with the results.

exact fit replacement for K1, well packaged with all parts needed to replace stock hot-end and switch to unicorn style nozzle.