Using hot wire to cut PLA 3d printed parts

Here is a video about how PLA 3d printed part is cut with hot wire cutter. The cutting looks easy and precise. Hot wire cutter are usually used to cut various types of  foam and are easy to make. Looks like they can cut some PLA plastics, I wonder what would they do with ABS ...




Here is a simple schematics of a DIY hot wire cutter:
















Video source:

https://www.youtube.com/user/DistractedArchitect?feature=watch