Rockbox bottom

My son decided to take up rock collecting so I'm going to try to print this box for him to store his rocks. I'll try and print the top part later.

The sides and bottom are 3mm thick and the inner divisions are 2mm thick. The holes to store the rocks are aproximately 3mm wide.


This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/9XZFblHWC3A