Prusa MK3 spool holder mod

I've found a number of spools have varying spool dimensions. AMZ3D sometimes has too narrow a center hole to go onto the newer Prusa spool holder without removing and reconnecting it. End is 30mm while the Prusa one is 35mm.

Version 1: Print upright with support enabled for everywhere so the connector at the top will be supported.

Version 2: Screw in. No support required. I found the hooks were the weak spot, at least in PLA. Redid it the so the two pieces screw together, right through the main branch of the stock Prusa holder.

Version 2.1: After a failure on the inner screw in part, I realize it would be stronger to just print two outer parts and a single center threaded core. Fit through the main stock branch is the same.