QIDI PLUS4 3D Printer, Max 600mm/s High-Speed Printing, 65℃ Chamber Heat, Fully Auto Leveling, 370°C Direct Extruder with Integrated Nozzle, Support PPS-CF Filaments, Large Print Size 12"x12"x11"

Far from new into 3d printing. I've had my Plus4 for about 6 months now, gone through probably 20-30 rolls of filament at this point printing everything from household items, car parts and accessories, to wargaming terrain and toys. I've primarily run PLA, but some ABS and some CF Nylon through it. Setup was fairly easy, as was updating firmware. I'm not new to Klipper either, and Qidi is running a much more recent version of Klipper than my previous XY machine from TwoTrees. I was very happy to see that.So far the only issues I have had was that my printer was one of the models affected by the older solid state relays for the chamber heater. I had not used the heater at that point and was advised by a friend to contact Qidi customer support. They sent me the upgrade kit quickly and with coherent and easy to follow instructions. I'm no stranger to working inside a printer, so it was a straight forward and easy swap to complete. I have since used the heated chamber, and other than taking a long time to heat up it works fine. I found the cooling fan for the mainboard to be a bit noisy and not as effective as I would like, so I swapped that out for a 120mm Noctua 24v industrial fan. I run that at 60% and it keeps my drivers and mainboard cool at a much lower volume. Otherwise I have had no major issues with this printer.My goal when purchasing this printer was to have the ease of use and speed of a bambulabs, with the open source and customizable nature of Klipper, and this printer has not disappointed. It has by far been the most reliable printer I have owned. It runs at the full rated speed without issue and the stock slicer profiles have all worked extremely well for me. I am anxiously awaiting the Qidi Box multi-filament upgrade. I would have liked it just a little bit better if it had a 320x320 like my SP5 turned Voron, and the Z height is slightly lacking, but this has not really been a limitation for me as of yet. Most print files out there are designed for a more "standard" 256x256 build platform, so the 305x305 has fit everything I've thrown at it.I've been extremely pleased with this printer so far, it's been a reliable tool which is what I was looking for.On final notes, the community, wiki, and github for this printer is quite active and helpful, and Qidi employees are active commentors and posters in those communities. Generally seen to be actively helping people problem solve, which I love to see.Excellent printer if you want speed and reliability without being locked into proprietary BS firmware and slicer software. It's reliable enough to be a solid and useful tool out of the box, but still gives you the freedom to modify and make it your own.

Update: It's still going strong after passing 4 thousand hours of print time. This has become one of my favorite printers to use, and after comparing results a bit more, I think this Plus 4 outshines my Bambu lab printers in print quality. It's a PET/Nylon/PPS powerhouse. I've had zero issues with zero maintenance other than swapping the hot end after jumping from PETG to PPS on the same hot end (it seems some leftover PETG oozed out of the top and caused a clog at the higher heat, a simple hot end swap fixed it in no time). PET-CF in particular comes out looking perfect and has become my go-to for functional parts.This printer was incredibly well packaged and free of damage or loose parts. It comes in a large and heavy (a bit over 70 pounds) box; having an extra set of hands isn't required, but it will be helpful when getting this printer into place. Checking the back, I noticed that my printer had the upgraded SSR board to fix the issues the original board would have for 110V areas.The setup was straightforward, with most steps displayed on the screen during the first bootup. It may not be quite as simple as getting Bambu printers up and running, but you won't be scratching your head wondering what went wrong. You can connect to your network via LAN or Wi-Fi; using this printer with OrcaSlicer is easy. Plus, the Fluidd UI is a step up for monitoring and adjusting prints compared to Bambu Studio's device tab, aside from some simple speed adjustment presets Bambu offers. At first, I had created a Fluidd account, but I found it caused some odd connection issues, so I just use it without any accounts, and I haven't had the same connection/moonraker issues.The print quality I've experienced is fantastic and rivals my P1S. With its increased hot-end range and heated chamber, this printer feels like a significant upgrade if you plan on printing engineering-grade materials. I've steered clear of Qidi printers in the past due to concerns over QA, and to be frank, I just thought they looked bulky and ugly. This new frame is gorgeous and really makes the printer look much more modern and sophisticated. I had planned on purchasing this printer a few months ago but was put off due to the news of the SSR issue, which now seems resolved. Other than the SSR, it seems this printer was well-designed and produced. The fact that the board was swapped out made me more confident in this printer's longevity and Qidi as a company.The build quality is very nice, maybe not quite as lovely as my Bambu machine, but the printer feels sturdy, doesn't make any rattling sound, and the outer panels sit flush with the machine. I found the door to be very sturdy and has a bit of resistance when opening or closing it. When printing low-temperature materials, this keeps the opened door from swinging about too much or slamming closed. Keeping the top lid and door slightly agape keeps internal temps around 33c. It will go lower if you fully open the door and remove the lid, but that wasn't necessary in my experience. For higher-temperature materials, closing the lid and door helps muffle the already quiet printer during use.I could go on; this really is a quality machine. If you're looking at a P1S or X1C, this could be a capable and more open-source alternative unless you need multi-material printing. There's supposedly a Qidi AMS clone on the horizon, but it seems pretty unknown at the moment. With Klipper under the hood, you may even be able to get an open-source MMU like the Enraged Rabbit Carrot Feeder to play with the Qidi Plus 4 (although no one has tried this yet, to my knowledge). I was mainly focused on printing more challenging materials, and my P1S already has an AMS, so this wasn't a concern for me.