K2 Plus CFS small spool spacers

K2 Plus CFS spacers for using smaller spools.I created this because some of my Sunlu spools are smaller than my Creality ones. I designed this off of the original. There are 3 sizes 10mm, 12mm, and 15mm the 15mm seems to work well with the Sunlu spools.I designed this with spring retention nubs which greatly helps when swapping from the originals to the spacers.