This is a mod for spool holder of the BCN3D+.
The BCN3D+ originaly comes with a spool holder for 1kg spools; the problem is how to hold those big 2.3kg spools.
This mod allows to use 1kg and 2.3kg spools, by just moving a couple of parts in a few seconds.
Just print 2 of Spoolbasex2 and 4 of Spoolsopx4; use the same original ballbearings that came with the BCN3D+ as well as the two arms that hold the supports together.
I've found that the best way to assemble the parts, is by pointing the two supports of one side outwards, and the other two outwards.