Re: STL file format units

From: Bathsheba Grossman (
Date: Fri Jul 18 2003 - 01:50:24 EEST

On Thu, 17 Jul 2003, Charles Overy wrote:
> 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.

The STL format is unitless, and there is no convention: the person
sending the file has to tell the receiver what unit to use.


Bathsheba Grossman                 phone (831)429-8224, fax (831)460-1242
Sculpting geometry                                
Solidscape prototyping                           
Protein crystals                             

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