After setting up the high-speed settings using the K1 printer's default slicer to a satisfactory level, I have now started conducting experiments to improve quality by using low-speed settings.

Creality K1 Default Slicer High-Speed Settings

Testing High-Speed Printing with the Default Creality K1 Slicer
I think the Creality K1 is a very useful high-speed 3D printer. However, the default slicer has many issues, and the biggest problem is that the provided default settings are very poor, and it is unclear what needs to be modified for high-speed printing. So, based on my experience, I will try setting high-speed printing values in the default slicer.
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To sum it up, the results were a disaster.

Refer to the video summarized below.

I tried lowering the speed using the default slicer, changing other settings, increasing the cooling time, and switching slicers, but.. surface quality issues similar to ghosting keep occurring.

So after the K1 arrived, I finally turned on the Sermoon v1 pro, which had been accumulating dust, and tried printing something. The quality came out really well..

I was shocked to see that the output was much smoother and more finished than the cube data from the K1 printed with the same data.

Since the K1 was designed with high-speed printing in mind, it seems difficult to expect high-quality prints when printing at low speeds.

And even in overseas communities, there is a lot of discussion about whether this issue is a software slicer problem or a hardware problem..

Although we might expect a slight improvement in quality through the slicer.. Even when using the Orca slicer, which is known for its good quality, the results were almost the same or only slightly better.

So my conclusion is that the K1's surface ghosting? quality degradation issue is likely a hardware issue.

I'm not sure if this is a motor vibration issue, a belt tension issue, or something else, but if this is the problem, I feel like Creality should solve it rather than the users having to solve it.

So, despite feeling a great sense of frustration that simply reducing the speed couldn't secure the quality, I found a hint that might allow me to solve the problem through a different approach..

I will summarize this in the following post.