Ender 3 Small spool holder - Clip in - Designed for spools with 16mm ID

Got my Ender 3 a week ago, my first foray into 3D printing.
Ordered some 0.5Kg spools of PLA.
They don't fit on standard spool holder.

Looked a several small diameter spool holders on Thingiverse but none would fit my printer as they were all designed for a screw in (nut / bolt) type spool holder. Whereas my machine has a bayonet style fitting (new design?).

So I have modeled one up.
Will hold 0.5kg spools with a 16mm ID.
With the print settings I have used it's easily strong enough to