Aluminum extrusion profile 20mm x 20mm

This is just a remake of the design: https://www.thingiverse.com/thing:280318

Remade the sketch in FreeCAD, so it would be easier to extrude and remix.

There are 2 versions avaiable, one with a 4mm central hole and another without a central hole.

Also added *.step files with a 1mm high version of these 20mm x 20mm extrusion profiles, for customization with programs that suport *.STEP files.

Source file made in FreeCAD available for download.

Enjoy.

CHANGELOG:
21/02/2017: Files