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Account for moves with negative E movements

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Added a rule so that LIN_ADVANCE isn't used for moves with negative E movements (de_float will be negative in this cases).
I also added a more detailed comment to make it more clear what the if statement does.
This commit is contained in:
Sebastianv650 2016-11-02 16:34:57 +01:00
parent 1ee0fdcad7
commit d448500643
1 changed files with 6 additions and 2 deletions
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8
Marlin/planner.cpp
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@ -1243,12 +1243,16 @@ void Planner::_buffer_line(const float &a, const float &b, const float &c, const
#if ENABLED(LIN_ADVANCE)
// Don't use LIN_ADVANCE for blocks if:
// !block->steps[E_AXIS]: We don't have E steps todo (Travel move)
// !block->steps[X_AXIS] && !block->steps[Y_AXIS]: We don't have a movement in XY direction (Retract / Prime moves)
// extruder_advance_k == 0.0: There is no advance factor set
// block->steps[E_AXIS] == block->step_event_count: A problem occurs when there's a very tiny move before a retract.
// In this case, the retract and the move will be executed together.
// This leads to an enormous number of advance steps due to a huge e_acceleration.
// The math is correct, but you don't want a retract move done with advance!
// So this situation is filtered out here.
if (!esteps || (!block->steps[X_AXIS] && !block->steps[Y_AXIS]) || extruder_advance_k == 0.0 || (uint32_t)esteps == block->step_event_count) {
// de_float <= 0.0: Extruder is running in reverse direction (for example during "Wipe while retracting" (Slic3r) or "Combing" (Cura) movements)
if (!esteps || (!block->steps[X_AXIS] && !block->steps[Y_AXIS]) || extruder_advance_k == 0.0 || (uint32_t)esteps == block->step_event_count || de_float <= 0.0) {
block->use_advance_lead = false;
}
else {