Summary: Everything wrong with Bridgeing settings

[tryptamine 3]

Dear Community,

I am experimenting on the bridgeing settings for a while now. 
Some things may be due to me not having found a perfect configuration yet, others are defenite bugs:

 

 

Bug 1

When selecting Wall Ordering from inside to outside and the print walls are thinner than the wall width (wall count * nozzlediameter) selected, bridgeing will start in mid-air, causing the print to fail completely (overexaggerated example with 8 walls):

I see no reason why this could be any good, and why one would not implement a setting where for bridges, wall order from outside to inside is always selected.

 

 

Bug 2)

With wall ordering from outside to inside, the wall lines of the bridge are printed fine (as they have supportive "real" wall lines from the outside).

However, the overhang (bridge without wall) fails on one side:

 

 

This is printed with 4 walls.

 

To make sure no other setting is causing this, i completely disabled coasting and linear advance, and set an infill overlap percentage of 50.0% 

Still, the bridges do not connect on one side, but perfectly on the other.

From the layer view in cura, i can not see why the left wall would work while the right one does not.



Bringing the wall count down to 2 for this model will solve the problem.

But i do not want to print only this model fine, but any model. Normally i use many walls to hide infill better and give stabilty, and using bridgeing is much worse than not doing so.



I hope maybe Bug2 is caused by my profile and can be solved somehow (without getting the wall count down)




I appreciate any response!

bridgeing_bug2.3mf bridgeing_bug1.3mf

Edited January 12, 2023 by tryptamine

[Currydani 0]

I can say that this is an actual problem, i can replicate it with this model. Somehow the fact that there will be bridging in the model is completely ignored until after the walls are generated.

[gr5 2,235]

@tryptamine - this is really good analysis and very helpful.  But it probably will be ignored unless you create a github issue.  Please please do so!  You have to create a github account if you don't already have one.  Then the next step is easy - just create an issue here:

https://github.com/Ultimaker/Cura/issues

Click that green button.

 

Please include your 3mf files and your excellent photos for the 2 bugs.  Maybe post them separately but they may actually be related.  Well, maybe not.  But should probably be both fixed by the same programmer.  You can either make 2 issues (and maybe link to each other) or you can make one issue and let the cura devs split it into two if they want to.  I guess it's best if you create 2 issues.

[tryptamine 3]

@gr5 Thanks for the response! I have a github account and just created a bugreport. Good hint!