This is a simple generator to create boxes and/or only inlays. You can combine boxes with smaller inlays (see pictures).
Adjustable are 
- Width, depth, height
- Thickness of the inner walls
- Thickness of the outer walls (0 for no outer walls)
- Thickness/Height of the base plate (0 for no base plate)
- Number of compartments in the width
- Number of compartments in the depth

Note:

When printing without base plate please consider using Brims.