Prusa Hanging Spool Holders

I liked the hanging spool holders in the print farm when I visited Prusa Research in Prague.
Fortunately, Dominik Císař who works at Prusa and designed them has put them on Thingiverse.

https://www.thingiverse.com/thing:3429734
https://www.thingiverse.com/thing:3429739

Prusa uses a metal hook to hang the spool from. I remixed their standard spool holder to be used together with a length of 8mm threaded rod.

I use them for my 2kg spools and also incorporated the use of two 625zz bearin