Where to find stl files: www.123dapp.com/gallery/content/all www.cults3d.com www.cgtrader.com www.fab365.net www.3dexport.com www.grabcad.com www.thingiverse.com www.tinkercad.com/things www.digible.net www.forge.zheng3.com www.sketchfab.com www.stlfinder.com www.trinpy.com www.shapeways.com www.yobi3d.com www.youmagine.com www.turbosquid.com www.pinshape.com www.myminifactory.com www.3dcadbrowser.com...