Well... more cooling seems to work. At least for the benchmark-object.
Following settings worked: 100% fan, 230°C hot-end temp, 100°C bed temp, no housing, no front cover, rest as above.
I guess that I've just been scared by hearing that ABS does bad things if it cools down to fast. Yes, it wraps if you cool it, but the heated bed seems to do a good job at limiting the negative effects and a 20 line brim gave enough adhesion to hold the object. I will test if this still works for bigger and more solid objects, as they have more problems with wrapping in my experience.
I don't print much ABS but in PLA the fix is to use more fan. MUCH more fan. Add window fans, turn on a vacuum cleaner backwards and blow a hurricane at the thing:
Now with ABS, it shouldn't need nearly as much fan. ABS has problems with layer adhesion - you need the current hot layer to be hot enough to melt the layer below slightly so that you get a good solid bond. It's very easy in ABS to print too cold or to have too much fan and result in bad layer adhesion. So with ABS you want the highest possible fan but still get good layer bonding.
Older slicers work better with ABS and they will turn the fan on during overhang passes and off on the rest of the layer. That's like on and off every few seconds. This is ideal. Cura is written in the "age of PLA" and so doesn't have this feature (overhang fan).
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