ANYCubic ACE FILAMENt spool GUIDE

ITs broken down into 4 individual inner tubes that have and end cap and pin. it works well so the weight of the other spools hold every thing on the rollers with a little friction. it also prevents your empty spool from being pulled up making a mess, i suggest to use the any cubic plastic roller guides for the spool. not sure what the magic in having this thing but it works and zero issues.