Possibility to have an partial bottom layer (internal brim)

[bitli]

When printing building like modles like 'http://nasa3d.arc.nasa.gov/detail/itokawa' or 'http://nasa3d.arc.nasa.gov/detail/gale-crater' we can have a bottom layer (which makes the piece difficult to remove and to assemble) or no bottom layer (which makes the piece not holding strongly enough to the platform and causes warping). I found it useful to have the possibility to define an bottom layer limited to the inside border of the object. Having tried it with about 10 mm on the Gale object it considerably helped fighting warping, does not create additional useless artifact as a brim and is simple to configure.
For example, a small cube with 12 loops results in the following bottom layers (see greenish inside part) It would be nice to have this possibily in MatterControl.
I have made a test implementation available at https://github.com/bitli/MatterControl/tree/limited-bottom-layer and https://github.com/bitli/MatterSlice/tree/limited-bottom-layer.

[MichaelPetitclerc]

This type of request has been made once more, a Brim option to have the brim only generate on the inside of the part. An example would be a cylinder with the brim option to only have the brim internally and no brim showing on the outside to keep the external surface clean.