Cura, printing a hollow cylinder, inner bottom starts in air because of smaller diameter and not enough infill

[Rejutka 4]

Sorry for the horrible title - I'm sure it's something that is often encountered, but I just can't force my mind to spit out the right words to just explain it in a simple sentence :-(

I've tried to search, but what good is all the knowledge of the world, if you don't know how to ask the question...

So, here's a picture that demonstrates what I mean:

(This happens with the old 15 Cura as well as with 2.4 .)

As you can see, the inner bottom (yellow) starts some distance from the edge - because Cura tries to save filament and the empty area is where the walls are going to be. Makes sense, in theory.

However, it also means that Cura tries to start the print on empty air - which naturally fails.

One way around would be to increase infill until it's tight enough to support the start of the bottom, but I don't want that much infill all through the print (though maybe 2.4 can vary infill? I've still not spent much time with it.)

So, how can I solve this? Surely it's not a rare issue?

[DaHai8 74]

One way might be to increase the Bottom Layer Thickness to equal the start of the inner layer bottom - making a solid bottom.

Not an efficient use of filament, but at least you could keep the infill to its minimum for the walls.