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
Geeetech Full Metal Aluminum
No need of supports because the angle is exactly 45 degrees.
Collar may be a bit tight at first but loosens after working it a bit. Screw the collar on and then add the main attachment. Use a screw and nut in place to tighten. Please wear eye protection.
Main model designed in Sketchup from scratch.