Let your filament slip, your bowden tube pop up... or break something !
|If the filament cannot slip nor be ground a bit,|
excessive pressure has to "break" something anyway.
When I tighten the idler completely to the maximum, the driving bolt grips the filament so well that the weakest point in the feeder mechanism becomes the PTFE bowden tube resistance itself.
As you can see on the pictures, my PTFE bowden tube got stretched and stripped in the pneumatic push-fit connector!
This seriously clogs the nozzle and it becomes a real drawback in the end: check my analysis below.