How to run Customizer on your own computer

**This page won't be updated anymore. [The new page with more up-to-date instructions is now here.](https://www.dr-lex.be/3d-printing/customizer.html)**

Please do not ask questions in this thing's comments about how to fix a problem with Customizer on Thingiverse. The whole purpose of these instructions, is to tell you how to run Customizer without needing the Thingiverse website at all.

*Old description below.*

This is a useless customizable thing, to demonstrate how to create a customized STL on your own computer instead of having to rely on Thingiverse's on-line Customizer app which has a history of breaking at random moments, sometimes for extended periods. For instance at the moment when I created this, attempting to run Customizer on the website resulted in this error at the side of the Thingiverse server:
*“/usr/local/bin/openscad/openscad: error while loading shared libraries: libCGAL.so.10: cannot open shared object file: No such file or directory”*

Another advant