How to make a perfect bridge?

[Nagisa]

How to make a perfect bridge?

[jaystein]

Use supports. I use .35 separation.

[Brunibbels]

Yesterday i encountered this weired type of bridging:


Explained: This is the first layer after Air and the Bridge is surrounded by something like U or |_|-form.
Slic3r did correctly bridge the long way from cliff to cliff. But Simplify3D did not.
Alike the picture it drew 2 perimeters to hover in the air. Afterwards it made bridges from those bogus two perimeters to the back wall.


Therefore I add my thing to the original question:
Is there any way to specify the direction of the bridging making it more perfect without having support?

[Support did solve some 90% of this problem!]
[Yes, this is some special case but could improve the overall handling of similar parts. The better way would be to rotate the bridging by 90° for most of the bridge.]

Greetings

[dkightley]

I think your base problem is that you're specifying a perimeter along the front that is not a straight line....there are six sharp corners!! These are created by the slicer and will extrude in free air....and go totally wrong as they are not supported!! The bridging routine is looking at the area that requires bridging, sees the free-air extruded filament as a "support" and not a bridged perimeter and generates bridging over the shortest gap.

Bottom line...this part is best printed laid down or with supports to hold the front edge, corners and all, up!