Bin/Box to hang on a 20mm tube

Here is the whole creation of my young son…

We did the whole process together using the caliper, calculating our dimensions, and making our drawings.

He spent an hour designing his project in Tinkercad, and I helped him finalize some curves and things he didn't understand how to do.
Anyway, after two hours of creation, here we are :

A complete bin/box that clips on a 20mm tube.
This is perfect for holding things up to 3-5 pounds while hanging and way more if rested on a flat surface.
 

The bin measures 145mm wide, 140mm long, and 120mm high.
A volume of 2.436 liters, or 2436cm³ (2436000 mm³).
 

It is a 972-layers (329g) project, and around 9 hours of printing...

Use profile: 0.20mm Strength
Infill: 25%
Walls: 6 walls