This set holds your plate, spoon, and cup in place. It can be screwed on a wooden board. It makes your tableware knock-over-proof. Very handy, if your eyesight isn't the best or if you generally tend to destroy dishes.
This video explains it (in German):
Translation: If you are blind, you knock stuff over at the dining table ... German stutter ... these 3D-printed helpers hold it in place for you ... Bismarckhering ... it can be disassembled to clean it up ... Sauerkraut ... thanks for watching!
It's pretty straight forward, I'd say. TS-plate-top.stl needs supports.