brian442 wrote:curious aardvark wrote:Is gap length greater than width: bridge width. This is basic common sense.
No, that is not correct. Bridging means you are trying to span a gap from one
foundation to another.
And if you drop perimeter priority below bridge priority you have foundation and you can print this properly.
The way it is calculated now Simplify3D prints perimeter in mid air and then attaches the bridge to its side -> no freaking way it will ever work. Not to mention it's not on top of it but to the side -> completely identical to 90 degree
curious aardvark wrote:
I don't see why I should have to cripple the design to work around awful bridging algorithms.
need a s much airflow as possible, which means thin walls and large gaps.
the chamfer solution I shown is actually "better design solution" irrelevant to bridging issue, especially for air duct
. it solves the Simplify3D bug + make part lot stronger (no matter if you print it with slic3r or cura or Simplify3D, no matter how the bridge is built) + helps with turbulence so should be used where possible (in air duct, always)
anyhow the Simplify3D behavior is still a bug, this is just a good way to work around it
curious aardvark wrote:
Cura bridges this part perfectly by going horizontal.
I would wager that makerbot and slic3r do so as well.
slic3r does, craftware does, dunno 'bout makerbot
curious aardvark wrote:
As far as there being no foundation to print on horizontally - there are three walls - 1mm thick.
I've set the bridging setting to overlap existing structures by 1 mm.
It actually draws a line across both ends of the duct so that it can try and anchor the long ways bridge.
So it can 'see' the walls.
That's the problem, Simplify3D prints perimeters first, and after printing them there are no more "foundations" left, they are "used" by the perimeter
.. that's the major bug with Simplify3D as it uses the space with perimeters and then it can't find place where to put the bridge on. If it calculated bridging first and then put in perimeters (where there's space) most of the bridging bugs will be gone, but ...
curious aardvark wrote:
And then there's the habit s3d has of printing things in midair, when there are - again - better alternatives.
yes. often they print in mid-air. I assume they are forcing this "support everywhere" thing as they tend to have a pretty decent support system so bridging and overhangs are not nearly as good as they can be