Support too small when the object intersect

[superzerg]

Hi,
An image is the best explanation:

Column support was enabled on Slic3r 1.2.0-dev on Ubuntu 13.10 .
The support on the bottom is too thin and breaks ruining the print.
When so little support remains it would better to:

• either don't put support (the support would then be totally supported by the object)
• either increase the support (restoring full or a more import part of the column before the object intersect)

Both option would work IMHO, but the current state put blobs of plastic on the object once the support is broken, which eventually make the print to fail.

Here is the simple Stl showing the problem: http://www.filedropper.com/testsupport2

[alranel]

Yeah, thanks for that.

[lordofhyphens]

Perhaps the clipping mechanism plus the detection of the bottom layers, I guess. We'd want to avoid tiny cross-sections (and expand the area out to some minimal area that will likely need to be configurable). Since we have clip_with_object, shouldn't be troublesome to arbitrarily increase the area and then clip away the object, accepting that we end up with suboptimal amounts of plastic extruded for supports.