My new PC is a Minisforum UM690S. Despite its small size, it is very powerful. However, the small computer has one drawback: the two case fans are quite loud and run at full speed constantly. Therefore, I opted for a small modification to replace the case fans.
A step by step tutorial is at https://www.haraldkreuzer.net/en/news/quiet-case-fan-for-the-minisforum-um690s
The author marked this model as their own original creation.