Where to find stl files: Recommended:www.thingiverse.comwww.cults3d.comwww.printables.com/en/modelwww.stlflix.com Others:www.sketchfab.comwww.pinshape.comwww.3dshook.comwww.grabcad.comwww.cgtrader.comwww.turbosquid.comwww.3dexport.comwww.yeggi.comwww.remix3d.comwww.fab365.netwww.tinkercad.com/thingswww.forge.zheng3.comwww.stlfinder.comwww.trinpy.comwww.digible.netwww.shapeways.comwww.yobi3d.comwww.youmagine.comwww.3dwarehouse.sketchup.comwww.3dcadbrowser.comwww.123dapp.com/gallery/content/allwww.libre3d.comwww.3dexport.com/free-3d-modelswww.tf3dm.comwww.treatstock.com/3d-printable-modelswww.open3dmodel.comwww.archive3d.netwww.3dcontentcentral.comwww.shapetizer.comwww.myminifactory.comwww.gumroad.comwww.stlfinder.comwww.3d-gallery.xyzprinting.com/en-US/promotionwww.3dprint.nih.govwww.3dexport.comwww.repables.comwww.instructables.comwww.libre3d.comwww.3dkitbash.comwww.rinkak-services.com/enwww.library.zortrax.comwww.fab365.netwww.polar3d.comwww.free3d.comwww.threeding.com/mobilewww.nasa3d.arc.nasa.gov/modelswww.zheng3.com/forge/index.php?id=-4www.redpah.comwww.digilab.dremel.com/resources/lesson-planswww.3dagogo.comwww.all3dp.comwww.malix3design.comwww.dtrstudio3d.wixsite.com/websitewww.zsculptors.comwww.cookiecaster.comwww.3dp.rocks/lithophanewww.instructables.comwww.nasa3d.arc.nasa.govwww.3dwarehouse.sketchup.comwww.3d.si.eduwww.sharecg.comwww.de.3dexport.comwww.3dcontentcentral.comwww.3dshook.comwww.printabrick.orgwww.repables.comwww.tinkercad.comwww.evermotion.org/downloadswww.blendswap.comwww.3dmodelfree.comwww.yobi3d.comwww.threedscans.comwww.blankrepository.comwww.3ddigitaldoubles.comwww.thepixellab.net/freebieswww.do3d.comwww.3dmag.orgwww.autodesk.com/products/fusion-360/overviewwww.grabcad.comwww.turbosquid.comwww.archive3d.net...