Creality Pi filament drier - stops filament tube being dragged into the drier and jambing the spool.

I made this after getting sick and tired of the filament bowden tube being dragged into my Creality Pi drier. Eventually it finds it's way to the spool edge and jambs hard in a hole on the side of the spool.

Initially, I used a zip tie around the tube- that lasted quite a few months. But it tends to crush and deform the tube - and apparently fails after a while. So I made this using a PC4 M10 bowden tube fitting and another design for a PC4 M10 thread mount- see here https://www.printables.com/model/889353-pc4m10-tapered-threaded-opening-stepstl-for-design . You print the PC4 M10 thread mount out (in PLA, PETG etc.) and then the part I designed is printed in TPU. 

The printed TPU part will fit into the Creality Pi's top filament feed hole (once the grommet is removed.) You then slide the PC4 M10 fitting (screwed into the threaded hole) onto the tube. (The PC4 M10 fitting will allow the tube to be pulled out from the drier, but not allow it to be pulled into the drier.) Get the PC4 M10 fitting position on the tube so there will be a small amount of tube inside the drier. Then push the tube through the TPU part and slide it in until the thread mount is seated in the TPU part. The teflon tube is a tight fit through the TPU part, it expands the TPU slightly in the Pi's filament hole- helping secure it in place.

To remove it all- pull the filament tube out first. Then the TPU part will wiggle out the Pi's filament feed hole.