Repair .STL File Errors    |    How to Fix .STL File Extension Errors    |    What is the .STL File Extension?

Run a Free Scan to check for STL related errors.

What is the .STL File Extension?

.STL File Extension Description:

The .stl file extension stands for STereoLithography, and is the standard used by Rapid Prototyping industries, developed by 3D Systems. Stereolithography is a common technology for constructing physical objects with good surface finish and high accuracy. STL files are generated through a machine called Stereolithography Apparatus, or SLA.

STL files are triangular representations of an object in 3D format. Each triangle composing an STL file shared common vertices and sides, and uses a Cartesian coordinate system that is also three-dimensional. This coordinate system defines three dimensions of space, which are height, length, and width; and uses the letters 'x', 'y', and 'z' to represent them.

The triangles that make up a file with the .stl extension are defined as facets. A unit normal and three vertices or corners identify each facet within an STL file uniquely. The facets define the boundary between the exterior and interior of the 3D object.

Files with the .stl extension serve as the link between Computer-Aided Design (CAD) models and SLA or Rapid Prototyping machines. Stereolithography CAD software uses .stl files to generate useful information to create 3D models on SLA Machines.

There are two types of storage format for STL files, which are Binary and ASCII. ASCII STL files are human-readable and take up a large amount of storage space. These .stl files can be edited using a text editor and are used for testing and debugging CAD interfaces.

Binary STL files are four times smaller than that of the ASCII type; and helps in providing use of smaller storage space. These .stl files use floating point numerical representation with the IEEE integer; and are organized with a header of 84 bytes and a 50 byte record for each triangle.

Author: Chuck Hill
Author URL:
Related Applications: Protogenic:, SolidView:, Autodesk:, Cadkey
Common Path: n/a


Run a Free Scan to check for STL related errors & to optimize PC performance.

Do you have errors with .STL files?

The Cause for .STL files Errors:

.STL files errors are potential severe Windows errors and are often caused due to a corrupt program registry that should be rectified immediately to avoid additional failure in other software and/or devices. While the errors persist your computer stays capable of possible blue screen errors, device failure and fatal crashes.

Symptoms of .STL files Errors:

.STL files error symptoms include software lock ups, shut down or start up troubles, slow pc performance, laggy behaviour, screen halts, internal speaker beeps, trouble saving program files as well as errors during program installs.

Helpful Tools

The following products are free to try. We have found them to be of the highest quality and value. They have been extremely useful in our own pc troubleshooting and maintainance and we highly recommend trying them out for yourself.

Anti-Malware Pro

With a lightning fast free scan and the largest authentic spyware detection database we have seen, Anti-Malware Pro finds and removes threats to your PC stability and security. Download Anti-Malware Pro


DriverFinder will scan your system for driver and software updates. Its easy to use interface makes keeping your drivers updated quick and simple. They will even send you an email notification when new driver updates are available for your system! It doesn't get any more convenient than this. Download DriverFinder

Browse File Extensions by Name:

Is your File Extension missing?

Help us to make the best resource we possibly can by submitting you very own file extension details. If you have detailed information on any file extensions please let us know by visiting the following link.

Submit File Details Form

What is the .STL File Extension?    |    How to Fix .STL File Extension Errors    |    Scan for .STL File Extension Errors