Let me explain as best as I can and forgive me if the answer is already found in the forums (it's a big site and hard to put the concept into a few keywords)
So I am printing some lego style blocks as counting blocks for teaching grade 3 math. They are usually called "Base 10 Blocks" and built with square blocks.
This is a 10x10x1cm 100's unit. The bottom 3mm has a recess for the 2mm tall studs when stacking blocks on blocks. So the majority of the 3D model is solid so I can use the CURA generated infill (20% cubic in this case). Printing on a Creality CR-6 SE.
The following slice preview shows the construction of the transition from the solid rectangular chunk to the solid studs.
For this specific layer, the infill was printed first then the circles for the inside wall of the infill, then the first layer of the general ceiling. Hopefully you can see the problem that some of the circles fall between the infill walls. In the real print, even though this layer looked very ugly, by the time it reached the outer layer of the shell, I was still achieving decent surfaces and studs.
Here are some options that I can think of. The first one would be my preference:
I would like to instruct the slicer to print a 100% infill at a specific layer or list of layers. So the yellow layer you see in the picture would be full yellow, and would act as an internal raft for any small, weirdly placed details. This would not take too much extra filament as it would simply ignore the circles on this layer and produce an efficient straight-line pattern. I would have to remember to preview the sliced model to determine the correct layer to use this option. Maybe this option exists but i can't recognize the keywords from the myriad of other settings in Cura.
Alternatively, I could insert a shaped void in the 3D model between the stud and block, forcing the slicer to add extra full layers at those locations. It is finikey to get the void modeled efficiently and would use more filament and time. It would be slicer independent though.
Lastly I could just use a grid infill with enough density so that I get a wall every 2.5mm or 3.33mm. But it's just more filament and time.
The output quality of this project is not intended to be very high but I can imagine that i will coming across this for a more accurate model in the future.
Any thoughts or suggestions? Your help is appreciated :)