Issues with internal bridging

Bambu Lab Software
1

I have a default cube stretched into a flat base, 1125x128x8 with a cylinder in the center. When the slicer changes from infill to top shells it lays down a bridge layer to support the infill layer above.

Why does the bridge go inside the cylinder ? both objects are default geometry created in the slicer, and the cylinder has different infill from the base. during these layers the cylinder also looses its walls ?

Trying to figure out how to stop the bridging from going inside the cylinder as it creates a structural weakness and with a long/taller cylinder you can easily break the part and it breaks at the bridge layer every time.

I can always merge the parts but then i loose the ability to increase the infill in the cylinder…

Here you can see layers

  1. last layer of infill before bridge
  2. bridge layer (bridge goes under cylinder)
  3. first shell layer (no walls on cylinder)
    99 top layer (ironing) the walls come back here on cylinder

1
11114×1111 155 KB

2
21108×1107 249 KB

3
31113×1108 136 KB

4
41113×1122 42.6 KB

With 100% infill on the cylinder the bridge goes completely under the cylinder as well even though it does not need any bridging ?

Here is layer 85 with 100% infill on the cylinder

5
51105×1111 248 KB

2

ok not sure why but increasing the number of wall loops from 2 to 3 on the cylinder fixes it so i guess asked and answered… here is layer 85 with 3 wall loops on the cylinder (was 2 before)

6
61108×1105 258 KB

3

Sounds like a structrual\stength parth so I usually go AT LEST 3 walls, usually 4 or more dependign the part anyhow.