Example of not packing all items

```go
p.AddBin(bp3d.NewBin("Bin", 60, 60, 60, 100))

p.AddItem(bp3d.NewItem("Item 1", 20, 60, 60, 1))
p.AddItem(bp3d.NewItem("Item 2", 60, 20, 60, 1))
p.AddItem(bp3d.NewItem("Item 3", 60, 60, 20, 1))
```

You algorithm will pack only the first two bins. Although it is possible to pack all three, just need to 3d-rotate them.