The one piece design is still the old one with the narrow opening not fitting all the Bambu Spool and others.
The six piece buildplate is the new design fitting more spools.
I noticed this after printing and cost me fillament and printtime. Not happy.
These spool holders are awesome, way better than the ones I used to use. I printed one with coupler you designed and it’s fine but it’s not super snug, which I would prefer. I’m going to add the couple I designed for the Bambu Lab spool holders as a remix to this one as well. keep up the good work, these are really awesome and have cleaned up my desk and shelves a lot.