I have an Ender 3 Pro with upgraded Bowden capricorn tube. The tube will move approximately 1-2 mm during normal operation, though it will not come out of the coupler at all. I have read that the movement if unchanging (constant movement of 1-2 mm) can be compensated for with settings adjustment to avoid retraction issues such that it will extrude or retract "that much less"... I do not understand how this is possible...
Im confused by comments that a slipping Bowden tube on the extruder side only, say by up to 2 mm, is "lost retraction"... I have this problem too with the Bowden tube only at the extruder end, not the hotend, and wonder if it is really an issue at all. Here's why...
The filament is in direct contact with the gear and wheel of the extruder. If the Bowden tube is only moving in/out of the extruder end of the coupler, there are no "gaps" being created to cause leakage of the filament, etc on the hot end...As the extruder is either pushing or retracting, the filament inside the tube is still moving as much as intended regardless of the amount of play of the Bowden tube... no? therefore, retracting will not be affected at all, nor would the extruding process. Am I wrong and if so, can someone explain to me how this would be?
Note, I can see that this movement may cause under-extrusion on the feeding side process, as the machine is expecting say, 0.5 mm extrusion, but then has to compensate (unknowingly) for the slipping out tube during the "push", so not enough gets "out", but should not affect the retraction amount as the filament is still being pulled directly from the gears/roller.
Am I wrong and if so, can someone explain to me how this would affect the retraction along with the under-extrusion?