|ABS on a Wanhao Duplicator 4S|
In my mind it is all about cooling. I had a custom cooling fan on the Wanhao that directed a tiny but powerful airflow onto the part that was being extruded right under the nozzle. I need this for the Ultimaker but have not found one out there in the wild. I may actually have to design one.
You might ask why it is important to print ABS? Namely that I find it to be a lot easier to clean an ABS print of the support material from the printing process!