I dont think its possible to print with ABS in any consistent manner. I've try many ways but warping is stronger than me.
I use a heated bed, tried with heaters blowing on it, super-glued the base down but it will then warp and split between layers higher up in the print. You might get lucky with a certain shaped print, but most of the time it will warp somewhere.
I only print large objects which are more prone to warping.
You do need some infill to support the surface while printing and brace the piece against warping, even if it is not needed for strength. Try 15%, and experiment.
You should definitely experiment with lower extruder temps - 260C is at the limit of the ptfe liner in the extruder, and most ABS prints fine in the 230-235C range. It varies quite a bit by manufacturer: with protoparadigm ABS, I print at 227C for best quality on my parts, and 225C for Ultimachine, although others might prefer higher for a smoother finish.
However, you can smooth the surface with acetone - search for "ABS smoothing acetone vapor" for better techniques than a paintbrush.
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