Help printing ABS

[printbus]

EDIT: I agree with your thinking that the bumps are not moisture related. They just aren't random enough.

Take a look at the gcode file for the cube in a viewer like gcode.ws. See if you can find a correlation between what the gcode file is instructing the printer to do and those bumps on the walls. They're likely something like the spots where the printer momentarily stops XY movement to raise up to the next layer.

There seems to be a trend of people using MakerFarm's old config files for Slic3r 0.9.9 with newer versions of Slic3r. Note that slic3r has added new configuration settings along the way. I would imagine Slic3r defaults to some value for the configuration parameters missing in those old files, but is that something you really want to rely on?