Unfortunately, there isn’t an easy button to push in Tinkercad to make intersection shapes. So, we need to do it in a few steps.
Step 1: Take a box and a sphere.
Step 2: Align them together as shown. You can use Align tool also.
Step 3: Click on sphere and change it to the hole.
Step 4: Group them.
Step 5: The shape will be look like as shown below. Change this resulting shape to hole.
Step 6: Drag another box.
Step 7: Align them as shown either use mouse or use align tool.
Step 8: Group them.
And now we have that intersection dice shape.
Making intersections in Tinkercad requires you to think a little outside the box, but it’s a great way to start thinking about how to create complex objects.