Universal holder for 51-60mm spools

Universal spool holder for any popular spool diameter 51-60mm, easiest to use, any caps, any complications necessary for mounting spool, just plug&go. Before this I made some other holders, also saw a lot of kinds, but in my opinion this is the best :)
I created it for mounting on the side of my X3D printer, but here I added also “flat” version for mounting on any flat surface.
Holder has two ball bearings and a kind of brake to avoid uncontrolled unroll of filament. During printing it genera