Bridging and support
I had some time to compare Prusa Slicer and Simplify3D. this issue is driving me crazy for a long time. I can't print a good looking enclosure, where only the walls are touching the plate (advice I got, flip the box upside down, but for several reasons, I cant').
When I use Prusa, I get a long "bridging" on some of my parts. I don't understand where is the problem. The best is to see the attached pictures as an example. You may have to double click the picture to see all whole picture, preview is showing part of the picture here.
Detect Bridging Parameters: on or off - does not make any difference.
Simpify3D is printing the part as I would expect.
I am attaching 3mf file also...layer 28 is the problem.
RE: Bridging and support
Both parts were printed with support - I left some of the support material in place on the Simplify3D part for illustration.
RE: Bridging and support
Try changing the bridging angle to what you want and across the shortest distance.
RE: Bridging and support
@neophyl
I tried - the angle in the example is set to zero(0) -- but see the picture , the bringing is not at zero.
If I try and set 2deg. (two deg) - the bringing is almost correct (across the short distance) ... but I am not sure that will fix it. Looks better in slicer, but I will have to print it to make sure.
RE: Bridging and support
Zero isn’t zero. Zero is auto. Set it to 180 degrees
RE: Bridging and support
@neophyl thanks - I'll try 180deg. In slicer it does look correct. I'll post the result when done printing.
just a side note: in simplify3D the part orientation on platter does not matter, and the layer slices correctly (always across the short distance). In PrusaSlicer, I have to change the bridging angle according to the part orientation on the platter. This maybe a problem when I print a square (equal side) shape . ;>)
RE: Bridging and support
while it is printing and 180deg.:
note the different supports in the below picture. I can't figure out how to force Prusa to add support under the whole part...
RE: Bridging and support
I’m not at my pc at the moment but there’s an option for don’t support bridges which is enabled by default, turn it off and then it will put supports under them.
RE: Bridging and support
@neophyl
I don't know how I missed that. I am printing at 180deg and Support Bridges now.
In the mean time, this is a sample of 180deg and Don't support Bridges setting.
RE: Bridging and support
Better, but not perfect. Simplify3D still better.
I must be missing something simple!
.
RE: Bridging and support
No. You aren’t missing anything. PS just doesn’t do bridging with support anywhere near as well.
Although one thing with supports that people often get ‘wrong’ is the contact distance, the default of 0.1 is too close. It makes any support difficult to remove. 0.2 to 0.25 works much better for support removal.
I also tend to up the interface layers to 4.
RE: Bridging and support
Outside the edit timeout
there are a few threads about it and I was trying to find a recent ish one where Bobstro posted some nice comparison pics with ps, Cura s3d etc but the search function here sucks. Only one I found was this one https://forum.prusa3d.com/forum/prusaslicer/poor-surface-due-to-bridging-infill-over-support/
RE: Bridging and support
Here's one of the discussions comparing bridging.
and miscellaneous other tech projects
He is intelligent, but not experienced. His pattern indicates two dimensional thinking. -- Spock in Star Trek: The Wrath of Khan
RE: Bridging and support
@neophyl
you are correct, the search is not the best. Before I posted my issue I was searching the forum, but I did not find the above referenced (poor-surface-due-to-bridging-infill-over-support/ ) article... thanks @neophyl. I thought I was the only one.
@bobstro -- also good read (one of the discussions comparing bridging.). thanks
So far, the S3D does the best job in these cases. I don't mind one step work around, but multi-step approach is not a good solution when you print different parts all the time (IMHO)
I tried to describe the problem here: https://github.com/prusa3d/PrusaSlicer/issues/4751
;>)
RE: Bridging and support
That was the one I was trying to find Bob, thanks.