The file 'Spool 2.4 – Use “Spool 2.5” 3D Printer Model' is (stl) file type, size is 68.4KB.
A spool 2.4 design, should work with a motor axle...
EDIT: for more precise spool meant for a moter axle search for "spool 2.5" or "1831569"
or go to "http://www.thingiverse.com/thing:1831569"
Spool_2.4.stl | 263.2KB |