About this 3D model

I've collected a full set of mendel parts, and replaced as many STLs as possible with existing OpenSCAD versions - including the latest versions of Vik's files and the OpenSCAD rework of Wade's geared extruder. I'm working to replace the remaining STLs with OpenSCAD re-works. Also on the todo list is unifying various configuration options into a single config file, and extracting more shared code into mendel_misc.inc. I will gladly accept patches, pull requests, additional files, etc. Let's hack on the mendel like a proper software project!