Grinding/Sanding Attachment Guide similar to Dremel

This is based on the Dremel Attachment for Sanding & Grinding. Drawn from scratch using Sketchup. Inner ring is from this thingi - http://www.thingiverse.com/thing:678471 - It was not manifold so fixed it using this free service from Microsoft - https://netfabb.azurewebsites.net/index.php. Upload IS manifold. Main attachment designed in Sketchup. Fits standard Dremel or Ozito Rotary Tool necks. Straight edge or 45 degree sanding/grinding. Build plate and main attachment Sketchup model files attached. Outer main module updated today - 9 Feb 2016 because in the other original file the dimensions of the sanding/grinding area was too big and too tall. This new file - OuterFinalSmall.stl is resized to the correct size. Also tidied up the main tubes to give a smoother finish. Youtube video of the thingi in use by NCHippy : https://www.youtube.com/watch?v=bcD584ighqA