Smoothing ABS prints

Using acetone vapor has been effective in smoothing ABS prints.

The slow way is to do it passively,

you can also use the heat bed to speed the process up.

this is the first instance i noticed.

Paul Harrison "Acetone vapour chamber for ABS plastic smoothing" claims "The real problem is to apply the acetone uniformly to the model.". Paul shows using a small fan to circulate the vapour uniformly.