diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_colonsegment1.py b/src/scaffoldmaker/meshtypes/meshtype_3d_colonsegment1.py
index 6d6cfc4b..a269c0cd 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_colonsegment1.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_colonsegment1.py
@@ -8,7 +8,7 @@
 import copy
 import math
 
-from cmlibs.maths.vectorops import normalize, set_magnitude, magnitude, dot
+from cmlibs.maths.vectorops import normalize, set_magnitude, magnitude, dot, cross
 from cmlibs.utils.zinc.field import findOrCreateFieldCoordinates
 from cmlibs.zinc.element import Element
 from cmlibs.zinc.field import Field
diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_esophagus1.py b/src/scaffoldmaker/meshtypes/meshtype_3d_esophagus1.py
index 7d9d4070..71628cad 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_esophagus1.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_esophagus1.py
@@ -7,6 +7,7 @@
 import copy
 import math
 
+from cmlibs.maths.vectorops import magnitude, normalize
 from cmlibs.utils.zinc.field import findOrCreateFieldGroup, findOrCreateFieldStoredString, \
     findOrCreateFieldStoredMeshLocation
 from cmlibs.zinc.element import Element
diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_heartarterialvalve1.py b/src/scaffoldmaker/meshtypes/meshtype_3d_heartarterialvalve1.py
index 711e3802..da505f15 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_heartarterialvalve1.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_heartarterialvalve1.py
@@ -8,7 +8,7 @@
 
 import math
 
-from cmlibs.maths.vectorops import eulerToRotationMatrix3
+from cmlibs.maths.vectorops import eulerToRotationMatrix3, magnitude
 from cmlibs.utils.zinc.field import findOrCreateFieldCoordinates
 from cmlibs.utils.zinc.general import ChangeManager
 from cmlibs.zinc.element import Element
diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles1.py b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles1.py
index 5554014b..39e87250 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles1.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles1.py
@@ -7,6 +7,7 @@
 
 import math
 
+from cmlibs.maths.vectorops import magnitude, normalize, cross, set_magnitude
 from cmlibs.utils.zinc.field import findOrCreateFieldCoordinates
 from cmlibs.zinc.element import Element, Elementbasis
 from cmlibs.zinc.field import Field
diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles2.py b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles2.py
index 1ceb9667..d465ab9c 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles2.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventricles2.py
@@ -6,6 +6,7 @@
 
 import math
 
+from cmlibs.maths.vectorops import magnitude, normalize, cross
 from cmlibs.utils.zinc.field import findOrCreateFieldCoordinates
 from cmlibs.zinc.element import Element, Elementbasis
 from cmlibs.zinc.field import Field
diff --git a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventriclesbase2.py b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventriclesbase2.py
index 0c58a117..a2ee053c 100644
--- a/src/scaffoldmaker/meshtypes/meshtype_3d_heartventriclesbase2.py
+++ b/src/scaffoldmaker/meshtypes/meshtype_3d_heartventriclesbase2.py
@@ -8,6 +8,7 @@
 
 import math
 
+from cmlibs.maths.vectorops import normalize, cross, magnitude
 from cmlibs.utils.zinc.field import findOrCreateFieldCoordinates
 from cmlibs.utils.zinc.finiteelement import getMaximumElementIdentifier, getMaximumNodeIdentifier
 from cmlibs.zinc.element import Element