We are all makers
The folks at iFeelBeta.de have created a chemical formula that will dissolve 3D-extruded PLA but leaves ABS alone. This is critical because it allows you to print a fabject with overhangs: you use the PLA as a support structure during the print, and when done you dissolve it. Now all we need are dual-extruder printers!
[Via the MakerBot blog]