Fabtotum feeder John Guest push fit air fittings clamp holder
UPDATED: sometimes the adapter crack when is bending the design is too fine, here is a heavy version, it work since a month without problems, you need a m3 screw to lock in place the 6mm ptfe tube
Sometimes the small clamp of the PTFE on the feeder pop out, you can find a replacement on ebay, part name is Push Fit Air Fittings John Guest ebay number PM0204E, more info on the fabtotum forum.
If your clamp is not broken, as a first aid you can bend a small meccano metal rail and lock using one of the screw of the feeder (photo).
This can be used to lock in place the clamp and the 6mm tube which is continuously sliding out.
Size is exact, sand if you have problems inserting place the 6mm tube. There is a hole for lock the tube but you don't need it.
Hope is usefull it bend with a smooth curve, a nice side effect it keep the tube straight and reduce filament tension inside the tube, less oozing :)
my apologies for my bad english :)
print with https://youtu.be/OPka5OrWT6c