2.05.1.1-simple_dynamic_unretraction
Pre-release
Dynamic Unretraction
Discussion: https://forum.duet3d.com/topic/14927/enhancing-pressure-advance/91?_=1585252458630
It looks at the extrusion rate of two print move sequences that are separated by a retraction. Then, the adjustment to unretraction is made as such:
adjusted_unretract_distance = nominal_unretract_distance + (second_sequence_extrusion_rate - first_sequence_extrusion_rate) * new_dynamic_unretract_constant
Usage: M207 C[the constant]
Only works with firmware retraction (G10/G11).
The retraction move cannot get reversed and cannot exceed the unretraction amount to prevent computation errors as it would invalidate the precomputed movement parameters.
Attaching the Duet via USB and connecting a terminal will output debugging information:
[272.833008 229.201004 3.613331] mt=0.096972, er=0.999899, up=-0.160771, ler=0.577527, ner=0.416756, ep=-0.000101
[X Y Z] mt=moveTime, er=nominal_unretract_distance, up=adjustment, ler=first_sequence_extrusion_rate, ner=second_sequence_extrusion_rate