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Bridge infill versus support  

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a.pykett0
(@a-pykett0)
New Member
RE: Bridge infill versus support
Posted by: @inf-17

I have an opening at the bottom about 15*15mm, 2mm height. The height is critical and I want to avoid the bridge infill and add manual support instead. I can't get rid of the infill and I can't get the manual support to work. How do I do that with PrusaSlicer?

/ Lars

After wanting to do exactly this (in the hunt for better surface quality above support material) and struggling to find the answer myself, I thought I'd post my solution:

On the 'Print Settings' tab in the slicer (i'm using version 2.1.0) under the heading 'Horizontal Shells', change the number of solid bottom layers to zero. This will remove the bridge infill. In the model I am slicing, I am using 100% infill (because the part is thin-walled) but it means that the bridge infill is replaced by 'internal infill'.

Interested to hear if this works in your scenario!

Posted : 11/11/2019 10:00 pm
maarten
(@maarten)
New Member
RE: Bridge infill versus support

I entirely agree that once supports are turned the flat undersurface of a bridge should be slidec exactly the same as the flat bottom or top of the object. 

 Here is the closest thing I have been able to create without the need for having 100% infill for the entire object.  

In short we force 100% infill only in a very thin layer at the underside of the bridge.  This replaces the bridge underside with 100% perimeter material, leaving no room for the unwanted stringy material preferred by the slicer software.

  1. right click on object in non sliced view
  2. select "add modifier > box or slab
  3. Scale the slab about 1-2mm thick.
  4. Scale and move it so it envelops the surface where we want to suppress bridging, and a few layers above that surface.
  5. Go to expert mode and find the slab item in the list of parts and right click on the gear next to that object in the list.
  6. Select layers and perimeters from the drop down menu
  7. Now click on the layers and perimeters line item which appeared for the slab object
  8. At the bottom of the screen, set the number of perimeters to something very high, like 100. It must be more layers than your bridged area is wide.
  9. Slice the object and inspect the bridge underside.
  10. Turn on the appropriate level of support so the bridge is fully supported by scaffolding material.

This is a lame and time consuming, yet effective hack.  I'd much prefer a checkbox and associated smarts in the software.

 

 

This post was modified 4 years ago by maarten
Posted : 08/01/2020 11:46 pm
needfulthings
(@needfulthings)
New Member
RE: Bridge infill versus support

Old post, I know. As far as I know you can deactivate any bridge infill by setting Contact Z Distance to zero in the Support Settings.

Posted : 13/04/2021 7:09 pm
Dan Rogers
(@dan-rogers)
Noble Member
RE: Bridge infill versus support

Still don't know why you can't just stand it on end and print it.  No bridges, no supports.

Posted : 15/04/2021 12:07 am
jluvs2ride
(@jluvs2ride)
Eminent Member
RE: Bridge infill versus support

@dan-rogers

I think he said it just shifted the problem somewhere else. I'd like to know how to get rid of bridge infil as well. If I use supports, why do I need that?

Posted : 27/05/2021 10:42 pm
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