
Well, okay, a pipe is not a cube ๐
The hole is hexagonal, 5 mm, made for the cord of my hoodie.
Inside, as an experiment, I created something like a spring.

The bricks and the question block I printed in 2 colors, and I added the 3MF profile.
In the 3MF profile, the file with the question block is different from the separate STL file attached here.
Easy to print, no supports โ
Credits:
bigovereasy