Ultimaker 2 Spool Holder for spool hub diameters < 30mm

This Ultimaker 2 spool holder is based on the original Ultimaker design files modified to match spools with diameters < 30mm.
The model has been run through Netfabb to ensure clean printing.
Feel free to Tinker with it here:
https://tinkercad.com/things/72lUkNeXGQj