Esun 50mm 8mm ID spool holder

Just a simple, slightly flared spool holder to fit on my i3 clone - The spool won't spin evenly on the threaded rod without an insert. I printed it to go with [this spool holder](http://www.thingiverse.com/thing:1743397)

It's 48mm on the inside face and 53 on the outside, fits on the 8mm threaded rod from the kit and allows you to tighten the nuts in the center the spool

Will add pics tomorrow.