This is an adapter for TC's MK3 Z-Axis Bowden Guide. I moved the spool off the top of my Ender 3 S1 Pro and needed a way to control how it fed into my printer. While this does use a T-nut and a screw, those do come with the Ender presumably for the printable handle. I see no reason to have the handle so I use those for this instead.
The author remixed this model.