STL
File format
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&h=300&w=300&tbnid=rMOoEWT11Qi0LM&q=STL+(file+format)&tbnh=225&tbnw=225&usg=AI4_-kR5dU7l4EwfBdg9k1LJmIcVfYYwUw&vet=1&docid=bnjWy7ZrkZKeSM&itg=1&sa=X&ved=2ahUKEwiE37aOg-CFAxWw4skDHbPMB0YQ9QF6BAgAEAQ)
&tbnh=100&tbnw=150&usg=AI4_-kTrb1mQ4WDkLdtBSZsXCY0wmNXsDg&vet=1&docid=zgX1k-3z-AsvbM&sa=X&ved=2ahUKEwiE37aOg-CFAxWw4skDHbPMB0YQ9QF6BAgAEAY)
&tbnh=84&tbnw=150&usg=AI4_-kQCB6P9VrqkRcseuPPP35kwwV0UHw&vet=1&docid=RrK104ILSLc43M&sa=X&ved=2ahUKEwiE37aOg-CFAxWw4skDHbPMB0YQ9QF6BAgAEAg)
&tbnh=118&tbnw=150&usg=AI4_-kSFxPVrqK0VkN5O2px7EiFeL-a9mw&vet=1&docid=-vO0iRzV0D2DkM&sa=X&ved=2ahUKEwiE37aOg-CFAxWw4skDHbPMB0YQ9QF6BAgAEAo)
STL is a file format native to the stereolithography CAD software created by 3D Systems. Chuck Hull, the inventor of stereolithography and 3D Systems’ founder, reports that the file extension is an abbreviation for stereolithography. Wikipedia