great THX @Bounet i Remixed it and added 2 holes for nuts / it works without too
The original Bambu Lab spool holder is such a pretty piece of metal I couldn't bear to put it away in a drawer forever since it goes to the worst possible place on the machine…
So, I gave it some feet :)
You will need 2 M3x10 or 12.
Personally, I ran an M3 tap through the holes but if you drill them a tad bigger you might just screw it in.
I printed it with 3 walls for strengths in PLA.
No support needed, extra cooling is best.