Slic3r and the "bottom" layers, when NOT on the build plate
Hey folks, I have a part I'm trying to print that involves a flat plate a few mm above the build plate. The part can be thought of as a pair of concentric pipes, with a flat plate between them. I've configured slic3r to use "concentric" for the top/bottom fill patterns, and it has dutifully applied that to the bottom most layer (on the build plate) and each of the ten or so top layers, at various heights. But for some reason, it is stubbornly NOT using it for the one layer that really NEEDS it: the bottom layer that is suspended in the air. If it DID, there are struts that would support the layer pretty well.
This is the slice preview of the first layer covering that span. You can see the yellow of the spars that reinforce the plate, and should be able to support bridging just fine (as can be seen on the left and right sides), but on the top and bottom of the circle... that's an super long stretch to bridge, and it's not making it successfully.
This is the part in question, in fusion 360, viewed from underneath:
Is there a switch somewhere I've not been able to find to make the top/bottom fill pattern actually apply to *all* the bottom plates?
Re: Slic3r and the "bottom" layers, when NOT on the build plate
I agree a straight line bridge would easily work, but concentric would require not straight. I have never tried a curved bridge to my recollection. Perhaps there are bridging setting for that? So far I just close my eyes and hope on bridging then open them briefly perhaps to adjust temp, speed of air via the lcd in real time. that will not solve your desires though.