Spool holder insert "rolleneinsatz"

Made a spool holder insert (rolleneisatz) for the Dutch PLA spool I just bought.

While creating this thing I noticed that thing:
http://www.thingiverse.com/thing:32391
includes a parametric spool holder created in OpenSCAD. Oh well, I learned using Autodesk 123D Design creating this part; 123D file included.