Top spool holder fore reprappro mendel

This is my first item at thingiverse.
I was inspired by the following thing: https://www.thingiverse.com/thing:11447

The model was created using onshape.

I wanted a spool holder for my Mendel that sits on the top of the printer.
It should work for spools with standard internal diameter.
I've uploaded all the 'blueprints" as well so one can verify that it fits with everything (with the spool and the printer) before actually printing it.