We got a Galaxy Book 10.6 a while ago and were searching for an appropriate case as the book cover is quite a pain to have on all the time. Turns out, there aren't any available. So I measured it and created some corner protectors. Attach them with double-sided tape inside of the gap.
They fit the best if the gap is somewhere between 8.8 and 9mm.
Printing on one of the outer sides was successful, no supports were required.
Have fun!
The author hasn't provided the model origin yet.