Hey is it still working fine? I got mine and loving it my only concern is people commenting with problems I have yet to see any my only problem so far is during the print the extruder plugged. And it paused it then I hit re try 3 times it un cloged and started the print were it left off no failed yet
I had a lot of issues with mine when I first got it, and they seem to mostly have subsided. I had some issues with filament with the CFS enabled but eventually I realized the sensors were bad on my CFS and Creality finally sent me the replacement hub a few months back and itās good now.
I still havenāt tested much PETG, but Iāve probably done 100+ hours of PLA with the K2 Plus without the CFS. Itās great with PLA. Absolutely no tweaking required and 0.16mm structural prints come out with almost indistinguishable layer lines.
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Sorry for the very late reply. I bought a K2 Plus Combo during March and absolutely love it! A few points to be aware of if you havenāt made your purchase yet, or for anyone else looking to purchase one.
- The CFS cable to the printer, or perhaps the connector in the printer, can cause connection problems. Mine worked perfectly until I accidentally bumped into the plugged in cable. Slowly moving the cable while plugged in solved the problem and it hasnāt recurred (yet). Iāll take the time to check if it is possibly broken solder at a later date.
- The connectors used to hold the tubes that guide the filament from the cfs to the buffer, from the buffer to the machine, and from the external filament to the machine, can be a bit difficult to manage, especially if you use them single handed. I made the mistake of trying to pull the tube out of one without pressing in the end of the connector (which releases the tube), and managed to damage one. Fortunately the machine does come with 1 spare, and after breaking one Iām not making the same mistake again!
- When changing between colors, you may end up with more waste material than is actually printed into your print. Something to keep an eye on.
Other than those little issues, the printer has been an absolute dream to use.
Iāve had my K2 plus for about a month now with two CFS units hooked up. Iāve had little to no issues with it aside from the CFS units getting jammed on occasion with the spring tension on the four-way spit being too much thereās a couple of fixes for it on YouTube. Other than that great printer good speed good quality. If youāre going to get into bigger printers like this, especially a new series then thereās bound to be some growing pains, but overall great printer, and worth the money in my opinion.
I had that problem with PETG. Fixed with setting changes:
Speed of the first cooling move: 2.2 ā 20
Speed of the last cooling move: 3.4 ā 10
Number of cooling moves: 4 ā 6
I havenāt had clumps of PETG clogging the nozzle since making those changes. That said, I also reduced the print temperature, because after replacing the nozzle hardware and the main board, it no longer was (as best I could tell) running 20 to 30 degrees cooler than it said it was. 
So there were a lot of variables for me, and I canāt say for sure whether that will actually help you.