smart filament sensor coupler

bigtreetech smart filament sensor to direct drive extruder coupler
easy to remove while filament is still loaded, for clearing jams in the extruder below

fits extruders with the plastic "push fit collars" that normally would hold a 4mm bowden tube...you can easily remove and insert the printed coupler

sensor should be relatively stable, but maybe adjust the horizontal expansion in your slicer if needed