Of course, you could consider it completly useless (and probably you would be right), but I would add that it is hollow and weighted, so that it always stops on the flat face (that is at the opposite of the number "1").
And the interesting thing is that the escape hole is too small for the support material to actually escape! It works because the un-sintered powder (the support material) that is trapped inside has a lower density than the sintered material.
To demonstrate this difference of density i designed two cubes:
one is solid and the other is hollow (once again, with no hole large enough for the support meterial to escape).
As soon as i find my @#$%! precision scale, I will calculate both densities and let you know.
If you want to test if materials other than Strong and Flexible have this property, the cubes are available for sale with no markup (and available for download).
I finally found my precision scale, and my experimental results are:
- density of sintered material: 0.97
- density of support powder: 0.43
which is very close from your data.
This should allow me to optimize the D1...So many things to design, so little time...