This semester a MakerBot Replicator 2 and MakerBot Digitizer are joining the Afinias we have in the JMU 3-SPACE classroom, so we will need a recycle/fail bin for PLA as well as ABS. These signs are a remix of MakerBlock's Recycling Symbols on Thingiverse using the new text Shape Script feature at Tinkercad. (Yes, I know this print is for work, but I designed and printed it at home, so it counts!)
STL file for ABS: http://www.geekhaus.com/makerhome/day138_recyclesignABS.stl
STL file for PLA: http://www.geekhaus.com/makerhome/day138_recyclesignPLA.stl
Tinkercad link: https://tinkercad.com/things/kFnjyIz3ROD-day-138-abs-and-pla-recycle-signs/edit
Thingiverse link: http://www.thingiverse.com/thing:224601
Settings: MakerWare .3mm/low in about 35 minutes.