STL file format units

From: Charles Overy (
Date: Fri Jul 18 2003 - 00:58:58 EEST

Hello all.

Quick question. Is there any formal set of units in the STL standard? In
other words is there anywhere that the type of units, inches, meters,
millimeters are called out? Or is it defacto or by convention in one unit or
another? My understanding is that it is unitless and is usually defined
when you open the file.

Many thanks

Charles Overy

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