I'm trying to get rounded endges on inner curved surfaces, but I'm unable to understand how to do it; I was able to to it on the external curved corner of cylinders (with bevel) and on edges (using circles or MetaFillet), but I wasn't able to do the same on surfaces like these (examples marked in red here; in green examples of what I was able to do):
I tried looking for tutorial, but all I found was for edges or using bevels, nothing addressing the curved edge on rounded edges (beside the built-in bevel option in cylinders).
I'd need something like MetaFillet, but circular-shaped, and if it exists I wasn't able to find it; I tried experimenting using donuts-shaped holes, but while I was able to get something like that, there was some imperfections I wasn't able to get rid of:
And I wasn't able to do anything about the circle on the second cylinder.
(Ignore the red corner, I was able to get it done after writing this post using a cube and a sphere.)
I'm making a model to print and I need those feature in my design; if there is a better StackExchange for this question I can move it.
