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 ✅

Personal use only⚠️ 👉 Check My Patreon 👈 your support is important to me 🫶