It is a knife block as entry for the knife holder contest. Very open design, so very easy to clean everything. It is inspired by the shape of a truss bridge.
It may also serve as a bridging torture test. I managed to print mine without any supports.
Be sure to print in this orientation:

And make sure you have the correct bridging parameters set. Maybe do some test before you start the print. Therefore, I added the test stl-file, which is a cutout of the hardest part to print.
I did some bridging test before committing 300 gr of PLA:

If these print fine, the total model will print fine too.
After printing mine, it occurred to me that maybe other people have different knife sets, so I made two more general versions.
The author hasn't provided the model origin yet.