This model is designed to keep filament on the spool unwinding 2 models include : 120mm is designed to guide the filament from the top portion of your spool and the 140mm can be used well if you filament feeds from the bottom. I have this working with https://www.thingiverse.com/thing:4853553 not sure if this would work with the standard holder. I am currently using this with my ender3 Max with direct drive and is working great so far. No supports ate needed however print the model with the filment feed flat on the bed