Problems with MakerWare Slicing: Lack of internal supports. Solutions/alt software?

[Alibert]

In S3D i can solve it by defining 3 processes. The first one is 10% infill and stops at height 3.0mm. The second one has the same settings but an infill of 50% and starts at 3.0mm and stops at 3.2mm (I have 0.2mm layer height here). The last one starts at 3.2mm height with 10% infill again. Process 1 needs 0 top layers, process 2 0 top and bottom layers and process 3 zero bottom layers. This gives a good support of the bottom layers of the recessed panels.

grid_3_processes.jpggrid_3_processes_done.jpg