diff --git a/src/libslic3r/Brim.cpp b/src/libslic3r/Brim.cpp
index de6486869..a7835f3e9 100644
--- a/src/libslic3r/Brim.cpp
+++ b/src/libslic3r/Brim.cpp
@@ -806,7 +806,7 @@ double configBrimWidthByVolumes(double deltaT, double adhension, double maxSpeed
 }
 
 //BBS: config brimwidth by group of volumes
-double configBrimWidthByVolumeGroups(double adhension, double maxSpeed, const std::vector<ModelVolume*> modelVolumePtrs, const ExPolygons& expolys)
+double configBrimWidthByVolumeGroups(double adhension, double maxSpeed, const std::vector<ModelVolume*> modelVolumePtrs, const ExPolygons& expolys, double &groupHeight)
 {
     // height of a group of volumes
     double height = 0;
@@ -824,7 +824,7 @@ double configBrimWidthByVolumeGroups(double adhension, double maxSpeed, const st
     }
     auto bbox_size = mergedBbx.size();
     height = bbox_size(2);
-
+    groupHeight = height;
     // second moment of the expolygons of the first layer of the volume group
     double Ixx = -1.e30, Iyy = -1.e30;
     if (!expolys.empty()) {
@@ -843,8 +843,8 @@ double configBrimWidthByVolumeGroups(double adhension, double maxSpeed, const st
     double thermalLength = sqrt(bboxX * bboxX + bboxY * bboxY) * SCALING_FACTOR;
     double thermalLengthRef = Model::getThermalLength(modelVolumePtrs);
 
-    double height_to_area = std::max(height / Ixx * (bbox2.size()(1) * SCALING_FACTOR), height / Iyy * (bbox2.size()(0) * SCALING_FACTOR));
-    double brim_width = adhension * std::min(std::min(std::max(height_to_area * maxSpeed / 24, thermalLength * 8. / thermalLengthRef * std::min(height, 30.) / 30.), 18.), 1.5 * thermalLength);
+    double height_to_area = std::max(height / Ixx * (bbox2.size()(1) * SCALING_FACTOR), height / Iyy * (bbox2.size()(0) * SCALING_FACTOR)) * height / 1920;
+    double brim_width = adhension * std::min(std::min(std::max(height_to_area * maxSpeed, thermalLength * 8. / thermalLengthRef * std::min(height, 30.) / 30.), 18.), 1.5 * thermalLength);
     // small brims are omitted
     if (brim_width < 5 && brim_width < 1.5 * thermalLength)
         brim_width = 0;
@@ -915,17 +915,17 @@ static ExPolygons outer_inner_brim_area(const Print& print,
                         if (currentModelVolumePtr != nullptr) groupVolumePtrs.push_back(currentModelVolumePtr);
                     }
                     if (groupVolumePtrs.empty()) continue;
-
+                    double groupHeight = 0.;
                     // config brim width in auto-brim mode
                     if (has_brim_auto) {
-                        double brimWidthRaw = configBrimWidthByVolumeGroups(adhension, maxSpeed, groupVolumePtrs, volumeGroup.slices);
+                        double brimWidthRaw = configBrimWidthByVolumeGroups(adhension, maxSpeed, groupVolumePtrs, volumeGroup.slices, groupHeight);
                         brim_width = scale_(floor(brimWidthRaw / flowWidth / 2) * flowWidth * 2);
                     }
 
                     for (const ExPolygon& ex_poly : volumeGroup.slices) {
                         // BBS: additional brim width will be added if part's adhension area is too small and brim is not generated
                         float brim_width_mod;
-                        if (brim_width < scale_(5.) && has_brim_auto) {
+                        if (brim_width < scale_(5.) && has_brim_auto && groupHeight > 10.) {
                             brim_width_mod = ex_poly.area() / ex_poly.contour.length() < scaled_half_min_adh_length
                                 && brim_width < scaled_flow_width ? brim_width + scaled_additional_brim_width : brim_width;
                         }
diff --git a/src/libslic3r/PrintObjectSlice.cpp b/src/libslic3r/PrintObjectSlice.cpp
index 2b5a7f1c8..73acda3b4 100644
--- a/src/libslic3r/PrintObjectSlice.cpp
+++ b/src/libslic3r/PrintObjectSlice.cpp
@@ -745,7 +745,6 @@ bool doesVolumeIntersect(VolumeSlices& vs1, VolumeSlices& vs2)
     if (vs1.volume_id == vs2.volume_id) return true;
     if (vs1.slices.size() != vs2.slices.size()) return false;
 
-    double offsetValue = 0.4 / SCALING_FACTOR;
     for (int i = 0; i != vs1.slices.size(); ++i) {
 
         if (vs1.slices[i].empty()) continue;
@@ -766,7 +765,7 @@ bool groupingVolumes(std::vector<VolumeSlices> objSliceByVolume, std::vector<gro
     int existGroups = 0;
     std::vector<int> groupIndex(objSliceByVolume.size(), -1);
 
-    double offsetValue = 0.4 / SCALING_FACTOR;
+    double offsetValue = 0.15 / SCALING_FACTOR;
 
     for (int i = 0; i != objSliceByVolume.size(); ++i) {
         for (int j = 0; j != objSliceByVolume[i].slices.size(); ++j) {