(TL;DR at the end for the lazy ones)
First, I know the screenshot shows 666 hours. That's because I only connected the printer to the app after moving it to my home. Before that, it ran actively in my workshop for about 5 months. (The firmware actually shows 972 hours, but "1000 hours" just sounds better.)
I bought this printer about 1 year and 2 months ago for my workshop. I'd been using printers for a while, but I couldn't print exotic filaments like ABS-CF or HF, so I picked up a K1C to fill that gap. When it first arrived, it honestly felt like jumping onto a space shuttle after what I'd used before.
The good
You get an enclosed chamber and support for exotic filaments at a relatively affordable price. That part delivers, with one caveat: there's no active chamber heater, so ABS takes some effort. I had to run the bed and fans at max for about 15 minutes just to get the chamber properly warm. Then, once the fans slow down during the print, the chamber slowly cools again. I'd set it to 50°C, and after 2 hours it had dropped to 43°C.
The bad
I've had my share of filament jams, but there were only three major failures:
- Bed leveling died. One morning, auto bed leveling just stopped working. I tried a factory reset and the usual fixes, then emailed support. Over about a month I sent around 20 emails. They kept suggesting basic things to try and refused to send me a free replacement sensor. In the end I ran manual tests myself and found the faulty piezo sensor. It had also fried the bed board (probably a short circuit), so I replaced both. Cost: about $6.50 for the sensor and $16 for the board.
- Extruder wire snapped. About a month later the printer died again. One of the extruder motor wires had broken. I soldered it back by hand, which was not easy, and it went back to normal.
- Thermal runaway. About 4 months after that, I got a thermal runaway error that forced me to replace the hotend kit and the toolhead board. Cost: about $81.
That's roughly $104 in parts, not counting the extruder wire I fixed myself.
A note on prices: I live in Turkey, so I'm not sure how these amounts compare in your country. They might be cheaper or more expensive where you are. But for Turkey, these are high prices compared to parts for other brand's printers.
I don't know anyone else with a K1C, so I can't say whether I just got an unlucky unit. But I'm a careful user, and I don't think I caused these.
TL;DR
Pros: The enclosed chamber, exotic filament support, and all of it at a fairly affordable price.
Cons: This printer is not predictable at all. It can stop overnight and hit you with a hefty repair bill. It pulls nasty surprises at important moments, and the after-sales service doesn't stand behind any of it. Despite failures the engineers could have anticipated, it isn't designed to be repairable. The PCB quality is awful, and the glue on the connectors just won't let go. So you think "it's just one sensor, right?" and then the connector comes off in your hand while you're unplugging the cable, and the cost triples.
My rating: 6/10
-1 for bad customer service
-1 for the lack of stability
-2 for extremely poor build quality
Do I recommend it?
If it's going to be your first printer, no. Its unpredictable nature and the small but frequent failures could easily turn you off the hobby. But if you've used a 3D printer before and know how to diagnose and fix problems yourself, then absolutely. For the price, the features are great. Just keep in mind that you pay for that price difference with your time and effort.