This model is for connecting the ptfe tube to when using the external spool holder, instead of using the one mounted to the x_axis, which moves with the Z-axis and can cause the filament to unwind or pull a spool off the holder. You can print this model with no supports. There are two models to choose from, one uses a m6 threaded hole for a bowden adapter and the other model has a 4.1mm hole to fit the tube. You can also use 3 of the 4 screws used to hold the shipping bracket to bolt the model to the z_collum

Edit: Added the Fusion 360 files in case you would like to re-mix or fine tune some features