Accessible Wade's Extruder

Nothing to see here. You really want version 3: http://www.thingiverse.com/thing:8252 (although this is still a good reference for the benefits of the accessible aspects.

**Version 2 now uploaded**. Generate STLs from the version 2 scad to get the version 2 changes. NOTE: To do this you must have configuration.scad from the prusa git repo in the same directory as gregs-wade-v2.scad so that bolt and nut sizes defined in that file can be used.

This is an extruder based strongly on the wades