Setting to limit randomized layer speed to infill only.

Don't merge to main (yet?) -- part of PPQ-41

Author: rburema

include/LayerPlan.h

@@ -168,6 +168,7 @@ class LayerPlan : public NoCopy
     bool min_layer_time_used = false; //!< Wether or not the minimum layer time (cool_min_layer_time) was actually used in this layerplan.
 
     Ratio random_speed_variance_ = 1.0; //!< For this layer. Default to 1.0 (100% = this layer is not 'variegated' w.r.t the others), see constructor.
+    bool random_speed_infill_only_ = true; //!< Apply the speed randomization to infill only, instead of the whole layer.
 
     const std::vector<FanSpeedLayerTimeSettings> fan_speed_layer_time_settings_per_extruder_;
 

src/LayerPlan.cpp

@@ -159,6 +159,7 @@ LayerPlan::LayerPlan(
         std::uniform_real_distribution<> dist(random_min, random_max);
         random_speed_variance_ = dist(gen);
     }
+    random_speed_infill_only_ = local_settings.get<bool>("random_speed_infill_only");
 }
 
 LayerPlan::~LayerPlan()
@@ -562,14 +563,18 @@ void LayerPlan::addExtrusionMove(
     const double fan_speed,
     const bool travel_to_z)
 {
+    const auto speed_factor_randomization =
+        (random_speed_infill_only_ && config.type != PrintFeatureType::Infill) ?
+        Ratio(1.0) :
+        random_speed_variance_;
     GCodePath* path = getLatestPathWithConfig(
         config,
         space_fill_type,
         config.z_offset,
         flow,
         width_factor,
         spiralize,
-        speed_factor * random_speed_variance_
+        speed_factor * speed_factor_randomization
     );
     path->points.push_back(p);
     path->setFanSpeed(fan_speed);