2n2r5 Parametric 2 Piece Interlocking Spool - 100% Printable

This is my take on a printable filament spool. I had a few parameters that I wanted to design to.

It really helped narrow down what I was setting out to do.

Entirely printable (including center hub)
Interlocking connection in center of hub
Ability to change inside and outside diameter of center of spool seperately
Tapper ability for both inside and outside of hub
Ability to make just spool hubs for pressure fit into tubing (paper towel roll, shipping tubes, toilet paper roll, etc)
low amount of plastic used - (teardrop cutout can be turned on and off)
Filament holes to hold during spooling then to tie loose ends
UPDATED: 7/14/13
Small Fixes to the connectors

There are still some options that I want to incorporate but they will have to wait for future designs.