Lulzbot TAZ Top Spool Holder

I wanted a spool holder that mounted on the top of my TAZ 4 without hardware of any type, so I threw this together. It's more solid than it needs to be, but it snaps into place on the 20mm extrusions and works beautifully. Uses a 3/4" dowel that just drops in.

I'd like to integrate some 608ZZ bearings, but
a) I was itching to get this made and didn't have any on hand, and
b) I'm concerned that the lack of friction will facilitate spool unraveling - probably not worth worrying about.