Can I print with the lid closed?
You can, but watch it closely. Heat can creep up the hotend with the lid on and cause clogs, especially with PLA, on tall prints and with TPU. Adding cooling, pausing partway through a long print or leaving the lid off can help, and slicer settings may play a part, so treat your first long enclosed prints as a test run.
Why does 'Comgrow' show up as the brand instead of Creality?
Comgrow sells the printer on Amazon and Creality 3D makes it. Comgrow describes itself as the first seller of Creality 3D printers on Amazon and says it has more than 20 technical staff for after-sales support, so it is the first port of call if something goes wrong.
Where can I get better setup help?
Start with the seller: Comgrow says it has more than 20 technical staff for after-sales support. Creality's own support resources and online owner communities (forums, video walkthroughs) are also worth bookmarking, particularly for tuning speed, cooling and slicer settings safely.
Do I need to watch it while it prints?
On long jobs, yes, at least until you have its cooling dialled in. Heat-creep clogs can strike mid-print, and one caught early is far easier to clear than one found after hours of failed printing. Keep an eye on the print and be ready to pause and unclog before the job is ruined.
Can it actually hit 600 mm/s in real prints, or is that just a spec sheet number?
That is Creality's claimed maximum, and like most printer speed claims, real-world usable speed depends heavily on the specific model's geometry, the filament, and how well the machine is tuned: sharp corners and fine detail generally force lower effective speeds than a flat, simple shape. Creality adds a G-sensor to counter ringing at speed, but expect some tuning before complex prints come out clean.
Is it good for a complete beginner to 3D printing?
Creality aims the K1 at an easy start: one-tap self-inspection before a job and a strain sensor in the heatbed that levels it automatically, removing the manual leveling that trips up many first-time owners. As a first printer it can be surprisingly easy to use once you get the hang of it. The heat-creep caveat means a beginner should watch early prints closely and be ready to adjust cooling.