ABS hates me, or more precisely it hates the draught from the window behind the printer. Every tall part splits along a layer line about two thirds of the way up, the corners lift off the bed, and the whole thing detaches itself with a small contemptuous click somewhere around hour three. PLA never did this. PLA is forgiving. ABS wants to be kept warm and still, and my cold spare bedroom in January is neither.
The actual fix is a heated chamber, an enclosure that holds the air warm so the part cools slowly and evenly instead of shrinking on one side and tearing itself apart. The proper version, with insulation and a controlled chamber heater, is firmly on the someday list, filed next to all the other projects that need a free weekend I do not have.
The stop-gap is an IKEA Lack table flipped into a box, the printer inside, a sheet of acrylic across the front and an old blanket over the top when I am feeling especially committed. No active heating, it just traps the heat the bed and hotend already throw off. It is ugly and it is not airtight and it raised the chamber by maybe fifteen degrees, but fifteen degrees was the difference between a cracked part and a whole one. The warping is mostly gone. Good enough to keep printing, which is the only spec that matters at half nine on a weeknight.