This is a bowden adapter that uses only printed parts.
It can be used to connect a 6x4 flexible PTFE tube (3mm filament) to a wade extruder instead of using pneumatic fittings.
Pneumatic fittings works great, but my intention was to design an adapter that allow to pass through it ( if needed ) and reach the space directly below the drive gear of the extruder.
All parts were printed in ABS while the clamp in flexPLA as well. With FlexPLA (the red one) it works surely better, but, if you do not have available, don't mind, with ABS makes a good job also.