Bridge not overlapping overhang perimeter
I have a model where it basically needs to be a circular raised area constructed of bridges with a hole in the center. The center circular hole perimeter is supported, and the slicer labels them as "overhang perimeter". The bridges overlap the regular outer perimeter, but they do not overlap the overhang perimeter for the hole, thus many of the strings don't stick. Here is the slicer preview of the bridge layer:
And here's the printed model, shown upside down:
Is there a way to make it overlap the inner perimeter in the same way it does the outer?
RE: Bridge not overlapping overhang perimeter
@pentarsol
I don't have a copy of your project file so I'm only guessing, However based on the images you've posted, I would switch your support type to something other then Organic for the center support, turn off "Detect bridging perimeters:", and adjust the "Infill/perimeters overlap" to a higher value, maybe something like 55 to 75% and try again.
If you post a Zip compressed copy of your project exported from prusaslicer, Users can take a look and offer more tailored suggestions.
The forums file server will only allow zipped files to be posted, so if you don't Zip it won't post. Once zipped you can use the "Add Media" to add it to your post.
Regards
RE:
So it looks like changing the support to grid makes it put supports under the ends of the bridges. I haven't tried printing, but the sliced image makes it look like this could work. The file I uploaded is with the support changed, but the other two options you suggested are still the old values. It appears to be only grid which works. Snug and organic don't create support for the bridge ends. I wonder why that is. Thanks!
RE: Bridge not overlapping overhang perimeter
@pentarsol
Bridging should attach to the perimeters, support holds the perimeters in this case. The problem you are experiencing was caused by the bridging not making good contact with the internal perimeters of the ring, I fixed this by setting the "Infill/perimeters overlap:" value. In this case I used a height range modifier at layer ranges 5.03-5.20 and layers 11.60-11.80 to target the problem areas, and change the value of the "Infill/perimeters overlap:" to 55%. As I mentioned in my provisos post you could probably have gone as high as 75% but it looks like 55 will do the job. I added a support enforcer and changed the support type to "For support enforcers only" Set to Snug, and its supporting the perimeters as it should, and will promote easier removal of the supports. Organic is not the best choice for the support needs of this model. I've added a file with all the changes I suggested, it should print fine, I encourage you to look through it and see if you agree, before printing.
P.s. I probably didn't have to add the support enforcers, but slic3r was leaving gaps around the perimeter rings in places I didn't like, and the enforces made them go away.
When you open the file and Slicer prompts you, and asks if you want to enable bridging perimeters Select "No"
Let me know how it goes and Good luck.
RE: Bridge not overlapping overhang perimeter
Thanks, that worked! I used 75% overlap to be safe. The snug support was a bit harder to take off, but the bridges were totally fine.
RE: Bridge not overlapping overhang perimeter
@pentarsol
Your welcome, glad to hear that.
Relative to the Snug supports, I noticed you had the Top contact Z distance: set to 0.15, I didn't want to change that because I don't know the nuances of your printer, you might consider testing and setting it 0.2 or some higher value, so the supports will come free easier. Some folks will set it all the way up to 0.25mm, but I've found that to be to high in almost every case I tried it. Even if you've finished this print, the information gained can help make it easier for future prints.