I suppose I'm coming at this feature from the point of view of someone who was debugging an "oozing" problem that occurred after a certain time, so in order to calculate the distance I would need to take the travel speed into account (plus acceleration but maybe not needed for a first-order guess!).
Hi you make a good point - most people will think in terms of distance. It's much easier for the user to set the limit as a distance rather than as a time (IMHO). But you're not going to think, hmm, those travels from one side of the piece to the other should be using retraction, let's set the value to, say, 100mS (or whatever). Hi yes, making it time based could be done as you suggest but do people want to think in terms of time or distance when considering this setting? When you look at the layer view you can see all the travels it is doing and think to yourself, hmm, those travels from one side of the piece to the other should be using retraction but those travels in a small area don't need retraction, let's set the value to, say, 10mm to stop the dribble on the long travels. Couldn't Cura calculate the distance automatically from the travel speed and the time parameter, and generate the appropriate GCODE to implement that? Setting it as a distance means that it will need to be adjusted if travel speed is changed. However I have to ask - why is it distance based? Shouldn't it be time based? The most common case, I imagine, is what I've described above, and this "oozing" effect is dependent on travel time not travel distance. This feature will help a lot if I need to keep Combing enabled. I have a complex shape that the head takes too long to navigate while travelling in Comb mode, and the molten filament dribbles out before it gets there, leaving a large gap at the same place for each layer. Having encountered the perfect scenario for this new feature, I am thankful.
When set to a non-zero value, combing travel moves that are longer than that distance will use retraction, to maintain optimal nozzle pressure for better print quality. It will be live and you can ask any questions to our CTO, Miguel Calvo.Max combing distance with no retract.
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