retraction also takes time. So sometimes combing speeds up a print because it doesn't have to retract. Sometimes it slows down a print because it's not going direct from point A to B but sometimes going the long way around (so it can stay within the print).
I don't know why combing and retraction are inextricably linked - I wish this feature had 4 modes instead of just 2. But lots of people turn off combing for the bottom layer to avoid ugly lines on the bottom layer. Turning off combing means you get more retractions and fewer extra lines.
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neotko 1,417
Combing instead of moving the from A to B search for paths of already printed areas to go though A to B. The intention is to avoid a retraction (in theory). There are more than one behavior on combing (no skin allows to remove scratches (or some) when using it with no retraction.
Basically, times goes up because travels from A to B is longer, and also since UM marlins don’t have separated the Travel & Print accel/jerk when used it might (not aure of this 100%) as a Print move, so if the combing is done on the perimeters where accel/jerk is really low, then the speed of the move should be even slower. But I suppose Cura devs already change accel/jerk for combing so it’s done as a travel accel/jerk and not like a print one?
Anyhow, longer travel distances, more print time.
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