Poor Bridging Question

[wirlybird]

Hi all,

Here are two pictures showing a bridge that didn't work well. The area is about 10mm across. Using PLA.
In the first picture it is harder to see but the arrows point to the start of the perimeter where the first few mm are extremely thin then the flow starts.
Bridging speed is 90% and multiplier is 95%.

In the second picture you can see as indicated by the arrows what is very "clumpy" extrusion.

Thanks for any suggestions!

[dkightley]

The best suggestion I can give based on these photos is attach a factory file to a post.....so we can see what you're trying to do.

[wirlybird]

It's a customer file so at this time I can't attach the FF.

To me it seems it should be a simple bridge to span a small opening.
I reset the bridge settings back to default but it didn't help.

I was letting it bridge this area so to not have to use supports in the cavity.

[horst.w]

Customer file, ok, but some more images / hardcopys are possible?

It would really help to see the complete STL-object with its contour and the print preview of the sensitive situation you have shown before and the preview of the terminated print.

Similar situation is the printing of a sphere to close the last cover on top. Without any substructure it is very difficult to get a satisfying result. Try to set the number of perimeters very high, 15 or more, set a process for the last 2 - 3 mm (more than the wall thickness) with LayerHeight 0,10 or minor and ExtrusionWidth to maximum of the nozzle. For this process it needs to adjust the extrusion as exactly as possible.

You can try out my advices with a sphere sinked down in the virtual print table of S3D for its last 5 mm.


Regards
horst.w
GER